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Rest mass of an atom in its ground state
Atomic mass (ma or m) is the mass of a single atom. The atomic mass mostly comes from the combined mass of the protons and neutrons in the nucleus, with
Atomic_mass
Standard unit of mass for atomic-scale entities
The dalton (symbol: Da), or unified atomic mass unit (symbol: u), is a unit of mass defined as 1/12 of the mass of an unbound neutral atom of carbon-12
Dalton_(unit)
Type of atomic measurement
Relative atomic mass (symbol: Ar; sometimes abbreviated RAM or r.a.m.), also known by the deprecated synonym atomic weight, is a dimensionless physical
Relative_atomic_mass
Mass per amount of substance
to the presence of isotopes. Most commonly, the molar mass is computed from the standard atomic weights and is thus a terrestrial average and a function
Molar_mass
Number of heavy particles in the atomic nucleus
The mass number (symbol A, from the German word: Atomgewicht, "atomic weight"), also called atomic mass number or nucleon number, is the total number
Mass_number
Mass of a stationary electron
i.e. unified atomic mass units (u), which has an energy-equivalent of about 8.187×10−14 joules or about 0.5110 MeV. The term "rest mass" is sometimes
Electron_mass
Number of protons found in the nucleus of an atom
the atomic number Z and the neutron number N gives the atom's atomic mass number A. Since protons and neutrons have approximately the same mass (and
Atomic_number
name etymologies. Standard atomic weight or Ar°(E) '1.0080': abridged value, uncertainty ignored here '[97]', [ ] notation: mass number of most stable isotope
List_of_chemical_elements
English rock band
at Tapton School in Sheffield, South Yorkshire, formed a band called Atomic Mass in 1976. Pete Willis joined in 1977, departing briefly but returning
Def_Leppard
Smallest unit of a chemical element
the lowest mass) has an atomic weight of 1.007825 Da. The value of this number is called the atomic mass. A given atom has an atomic mass approximately
Atom
Mass of a given molecule in daltons
molecular mass is the unitless ratio of the mass of a molecule to the atomic mass constant (which is equal to one dalton). The molecular mass and relative
Molecular_mass
Def Leppard are an English rock band formed under the name Atomic Mass in 1977 in Sheffield as part of the new wave of British heavy metal. At the time
List of Def Leppard band members
List_of_Def_Leppard_band_members
Chemical substance not composed of simpler ones
universal atomic mass units (symbol: u). Its relative atomic mass is a dimensionless number equal to the atomic mass divided by the atomic mass constant
Chemical_element
Relative atomic mass as defined by IUPAC (CIAAW)
multiplying it with the atomic mass constant dalton. Among various variants of the notion of atomic weight (Ar, also known as relative atomic mass) used by scientists
Standard_atomic_weight
System of measurement
The atomic units are a system of natural units of measurement that is especially convenient for calculations in atomic physics and related scientific fields
Atomic_units
SI unit of amount of substance
be specified. The molar mass of a substance is equal to its relative atomic (or molecular) mass multiplied by the molar mass constant, which is almost
Mole_(unit)
Atomic theory is the scientific theory that matter is composed of particles called atoms. The definition of the word "atom" has changed over the years
History_of_atomic_theory
Atoms of the same element, but different mass
are three isotopes of the element carbon with atomic mass numbers 12, 13, and 14, respectively. The atomic number of carbon is 6, which means that every
Isotope
radii see Covalent radius. Just as atomic units are given in terms of the atomic mass unit (approximately the proton mass), the physically appropriate unit
Atomic radii of the elements (data page)
Atomic_radii_of_the_elements_(data_page)
Elements predicted but not found in 1869
that year. Mendeleev had predicted an atomic mass of 44 for eka-boron in 1871, while scandium has an atomic mass of 44.955907. In 1871, Mendeleev predicted
Mendeleev's predicted elements
Mendeleev's_predicted_elements
Subatomic particle with positive charge
and neutrons, each with a mass of approximately one dalton, are jointly referred to as nucleons (particles present in atomic nuclei). One or more protons
Proton
Core of an atom composed of nucleons
mass of a nucleus to nearly the same extent as the protons. Neutrons can explain the phenomenon of isotopes (same atomic number with different atomic
Atomic_nucleus
Difference between actual mass and mass number for nuclei
The mass excess of a nuclide is the difference between its actual mass and its mass number multiplied by the atomic mass unit (dalton). It is one of the
Mass_excess
Minimum energy required to separate particles within a nucleus
The mass of an atomic nucleus is less than the sum of the individual masses of the free constituent protons and neutrons. The difference in mass can be
Nuclear_binding_energy
1911 theoretical description of an atom
central volume containing most of the atom's mass. The central region would later be known as the atomic nucleus. Rutherford did not discuss the organization
Rutherford_model
Energy required to separate particles
in chemistry. Mass change (decrease) in bound systems, particularly atomic nuclei, has also been termed mass defect, mass deficit, or mass packing fraction
Binding_energy
Conversion constant for amount of substance
average mass m(X) of one particle of a substance to its molar mass M(X). That is, M(X) = m(X) ⋅ NA. Applying this equation to 12C with an atomic mass of exactly
Avogadro_constant
British chemist and physicist (1766–1844)
biochemists use the unit of mass dalton (symbol Da), also known as the unified atomic mass unit, equal to 1/12 of the mass of a neutral atom of carbon-12)
John_Dalton
Study of electromagnetic radiation absorbed/emitted by atoms
when used with mass spectrometers, are recognized for their outstanding analytical performance and their versatility. For all atomic spectroscopy, a
Atomic_spectroscopy
Subatomic particle with no charge
massive collapsing stars, consist of neutrons at the density of atomic nuclei but a total mass more than the Sun. Neutron properties and interactions are described
Neutron
Type of mass spectrometry that uses an inductively coupled plasma to ionize the sample
Compared to atomic absorption spectroscopy, ICP-MS has greater speed, precision, and sensitivity. However, compared with other types of mass spectrometry
Inductively coupled plasma mass spectrometry
Inductively_coupled_plasma_mass_spectrometry
giving energy through the loss of mass when the two nuclei collide and fuse at high temperatures. 4H (atomic mass 4.02643(11) Da), with one proton and
Isotopes_of_hydrogen
Physical constant in chemistry
12 g/mol. The molar mass of a substance (element or compound) is its relative atomic mass (atomic weight) or relative molecular mass (molecular weight or
Molar_mass_constant
Tabular arrangement of the chemical elements
formulated the periodic law as a dependence of chemical properties on atomic mass. As not all elements were then known, there were gaps in his periodic
Periodic_table
Mass of one equivalent
Equivalent weight has the units of mass, unlike atomic weight, which is now used as a synonym for relative atomic mass and is dimensionless. Equivalent
Equivalent_weight
Historical scientific theory
(Bromine). The atomic mass of Cl is not an arithmetic mean of the atomic masses of F and Br. As the techniques for accurately measuring atomic masses improved
Döbereiner's_triads
Amount of matter present in an object
"metric ton"), equal to 1000 kg the dalton (Da) or unified atomic mass (u), equal to 1/12 of the mass of a free carbon-12 atom, approximately 1.66×10−27 kg
Mass
Type of molecular mass
determined) mass. For small molecules made up of low atomic number elements the monoisotopic mass is observable as an isotopically pure peak in a mass spectrum
Monoisotopic_mass
International. Atomic mass: (applies to each element) the average mass of the atoms of an element, in daltons (Da), a.k.a. atomic mass units (amu). Atomic number:
List_of_materials_properties
strongly dependent on how those units are defined. For example, the atomic mass constant m u {\displaystyle m_{\text{u}}} is exactly known when expressed
List_of_physical_constants
Oxide mineral
which is unusually high for a transparent mineral composed of the low-atomic mass elements aluminium and oxygen. Corundum occurs as a mineral in mica schist
Corundum
Reaction that splits an atomic nucleus
mass number, Z is atomic number, mH is the atomic mass of a hydrogen atom, mn is the mass of a neutron, and c is the speed of light. Thus, the mass of
Nuclear_fission
Physical quantities being measured
the mass spectrum is displayed. The dalton (symbol: Da) is the standard unit that is used for indicating mass on an atomic or molecular scale (atomic mass)
Mass_(mass_spectrometry)
British musician (born 1959)
School.[citation needed] At the age of 18, Elliott tried out for the band Atomic Mass as a guitarist following a chance meeting with band member Pete Willis
Joe_Elliott
Isotope of Carbon
importance in its use as the standard from which atomic masses of all nuclides are measured, thus, its atomic mass is exactly 12 daltons by definition. Carbon-12
Carbon-12
Chemical law about ratio of substances in a compound
multiples of the mass of hydrogen. This was later rejected in the 1820s and 30s following more refined measurements of atomic mass, notably by Jöns Jacob
Law_of_definite_proportions
Chemical element with atomic number 4 (Be)
missiles, spacecraft, and satellites. Because of its low density and atomic mass, beryllium is relatively transparent to X-rays and other forms of ionizing
Beryllium
Chemical element with atomic number 117 (Ts)
element; it has symbol Ts and atomic number 117. It has the second-highest atomic number, the joint-highest atomic mass of all known elements, and is
Tennessine
Chemical element with atomic number 98 (Cf)
sixth transuranium element to be synthesized, and has the second-highest atomic mass of all elements that have been produced in amounts large enough to see
Californium
Chemical element with atomic number 118 (Og)
elements in the periodic table. Oganesson has the highest atomic number and highest atomic mass of all known elements. On the periodic table of the elements
Oganesson
Scientific background leading to the discovery of subatomic particles
atom has its mass and electric charge concentrated in a tiny nucleus. By 1920, isotopes of chemical elements had been discovered, the atomic masses had
Discovery_of_the_neutron
Chemical elements that do not occur naturally
product of atomic bombs or experiments that involve nuclear reactors or particle accelerators, via nuclear fusion or neutron absorption. Atomic mass for natural
Synthetic_element
Physical quantity of interest in chemistry and electrodynamics
molecular or atomic mass of the ion in daltons (Da), where the numerical value of m/Q is abstruse. The m refers to the molecular or atomic mass number (number
Mass-to-charge_ratio
Mass per unit volume
Italian together with a modern English translation [1] "2022 CODATA Value: atomic mass constant". NIST. May 2024. Retrieved June 8, 2025. "Test No. 109: Density
Density
Mass effects on spectroscopy
respectively. This shift reflects the differing reduced mass for the affected bonds. Isotope shifts in atomic spectra are minute differences between the electronic
Isotopic_shift
Formula to approximate nuclear mass based on nucleon counts
it from the Bethe–Weizsäcker process) is used to approximate the mass of an atomic nucleus from its number of protons and neutrons. As the name suggests
Semi-empirical_mass_formula
Definition of the units kg, A, K and mol
NA = (g/Da) mol−1, but that the unified atomic mass unit (mu) retain its current definition based on the mass of 12C, ceasing to exactly equal the dalton
2019_revision_of_the_SI
Relative proportion of an isotope as found in nature
planet. The relative atomic mass (a weighted average, weighted by mole-fraction abundance figures) of these isotopes is the atomic weight listed for the
Natural_abundance
digits. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS)
Isotopes_of_lithium
Unit of mass
more formally correct "milli unified atomic mass unit" (mu) and equivalent to 1/1000 of the unified atomic mass unit (u). A more modern name is the millidalton
Milli_mass_unit
Transformation of a nuclide to another
(total atomic mass number). An example of this notation follows: 6 3Li + 2 1H → 4 2He + ?. To balance the equation above for mass, charge and mass number
Nuclear_reaction
Chemical element with atomic number 83 (Bi)
Bismuth was formerly understood to be the element with the highest atomic mass whose nuclei do not spontaneously decay, but in 2003, it was found to
Bismuth
Type of particle accelerator
m_{\text{u}}} is the atomic mass constant, Q {\displaystyle Q} is the charge of the beam particles, and A {\displaystyle A} is the atomic mass of the beam particles
Cyclotron
temperatures from the Dulong–Petit law value of 3 R, are usually due to low atomic weight plus high bond strength (as in diamond) causing some vibration modes
Table of specific heat capacities
Table_of_specific_heat_capacities
The isotopes of cobalt range in atomic weight from 50Co to 78Co. The main decay mode for isotopes with atomic mass less than that of the stable isotope
Isotopes_of_cobalt
decay in which an atomic nucleus emits an alpha particle and thereby transforms or "decays" into a different atomic nucleus, with a mass number that is reduced
Glossary_of_physics
Related to Periodic Table
be a stable nuclide). This single nuclide will have a characteristic atomic mass. Thus, the element's natural isotopic abundance is dominated by one isotope
Mononuclidic_element
Chemical element with atomic number 39 (Y)
Yttrium is a chemical element; it has symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanides and
Yttrium
Cyclical variations in the ratio of the abundance of oxygen
the ratio of the abundance of oxygen with an atomic mass of 18 to the abundance of oxygen with an atomic mass of 16 present in some substances, such as polar
Oxygen_isotope_ratio_cycle
Set of nuclides that cannot undergo beta decay
the mass difference. Hence, current mass determinations cannot decisively determine whether 256Cf is beta-stable or not. While the AME2020 atomic mass evaluation
Beta-decay_stable_isobars
digits. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS)
Isotopes_of_mendelevium
Russian chemist (1834–1907)
Properties of the Atomic Weights of the Elements, which described elements according to both atomic weight (now called relative atomic mass) and valence.
Dmitri_Mendeleev
Characterization of nuclide stability
called the atomic number, Z, and a unique number of neutrons, called the neutron number, N. The mass number, A, of a nuclide is the sum of atomic and neutron
Valley_of_stability
Topics referred to by the same term
Radar-absorbent material Rechargeable alkaline manganese battery Relative atomic mass Reliability, availability, and maintainability, in logistics Root apical
Ram
British bass guitarist
schoolmates, including Tony Kenning, and eventually Pete Willis. As Atomic Mass they mostly covered Queen, Slade, Deep Purple, Jimi Hendrix, and other
Rick_Savage
Isotope of radium
Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C.
Radium-226
Abbreviations used in chemistry
with its signification. Also given is each element's atomic number, atomic weight, or the atomic mass of the most stable isotope, group and period numbers
Chemical_symbol
Type of radioactive decay
as nuclear transmutation. This new element has an unchanged mass number A, but an atomic number Z that is increased by one. As in all nuclear decays,
Beta_decay
Topics referred to by the same term
neurotransmitter Dalton (unit) (symbol Da), also called the unified atomic mass unit Deca- or da-, an SI prefix for a factor of 10 Distribution amplifier
DA
Material capable of sustaining a nuclear fission chain reaction
fissile. Most nuclear fuels have an odd atomic mass number (A = Z + N = the total number of nucleons), and an even atomic number Z. This implies an odd number
Fissile_material
Series of radioactive decays
atomic mass number (A) of the nucleus, and always decreases it by four. Because of this, almost any decay will result in a nucleus whose atomic mass number
Decay_chain
Situations involving imperfect or unknown information
example, it is likely that for 31.7% of the atomic mass values given on the list of elements by atomic mass, the true value lies outside of the stated
Uncertainty
digits. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS)
Isotopes_of_fermium
Series of scientific calculators by Texas Instruments
there is a bug on the sixteenth menu entry for atomic mass unit, "u", which should display as "Atomic Mass U". When this entry is displayed in the top row
TI-36
Most stable isotope of radon
8 years for both transitions. The latest edition of the Atomic Mass Evaluation gives a mass difference of (−6 ± 8) keV; thus the single beta decay is
Radon-222
Function describing an electron in an atom
In quantum mechanics, an atomic orbital is a function describing the location and wave-like behavior of an electron in an atom. This function describes
Atomic_orbital
Experiments proving existence of atomic nuclei
Counting the scintillations, they observed that metals with higher atomic mass, such as gold, reflected more alpha particles than lighter ones such
Rutherford scattering experiments
Rutherford_scattering_experiments
Isotope of bismuth
Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C.
Bismuth-209
Empirical rule in nuclear physics
that depend on the isotope's atomic number Z. The law works best for nuclei with even atomic number and even atomic mass. The trend is still there for
Geiger–Nuttall_law
Mode of radioactive decay
of an atomic nucleus. For a nuclide (A, Z) with a number of nucleons A and atomic number Z, double electron capture is only possible if the mass of the
Double_electron_capture
Isotope of hydrogen with two neutrons
exceeding the maximum allowed tritium levels in the coolant. Tritium has an atomic mass of 3.01604928 Da. Diatomic tritium (T2 or 3H2) is a gas at standard temperature
Tritium
Chemical element with atomic number 87 (Fr)
Francium is a chemical element; it has symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223 (originally called
Francium
Density of the nucleus of an atom
saturation mass density is thus ρ 0 = n 0 m u ≈ 2.5 × 10 17 {\displaystyle \rho _{0}=n_{0}m_{\rm {u}}\approx 2.5\times 10^{17}} kg/m3, where mu is the atomic mass
Nuclear_density
Metric unit of mass
The kilogram (also spelled kilogramme) is the base unit of mass in the International System of Units (SI), equal to one thousand grams. It has the unit
Kilogram
digits. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS)
Isotopes_of_uranium
Explosion of a star 8 to 45 times the mass of the Sun
elements. Unlike the Sun, massive stars possess the mass needed to fuse elements that have an atomic mass greater than hydrogen and helium, albeit at increasingly
Type_II_supernova
Chemical compound
cyclohexyl carboxylic acids with molecular weights of 120 to well over 700 atomic mass units. The main fractions are carboxylic acids with a carbon backbone
Naphthenic_acid
Nucleosynthesis pathway
half the atomic nuclei heavier than iron. In the s-process, a seed nucleus undergoes neutron capture to form an isotope with one higher atomic mass. If the
S-process
Expression of monatomic ideal gas entropy
specified), for one mole of an ideal gas composed of particles of mass equal to the atomic mass constant (mu = 1.66053906892(52)×10−27 kg). Its 2018 CODATA
Sackur–Tetrode_equation
Nuclear fusion reaction
possible confusion. All values are calculated with reference to the Atomic Mass Evaluation 2003. The limiting (slowest) reaction in the CNO-I cycle is
CNO_cycle
ATOMIC MASS
ATOMIC MASS
Boy/Male
Tamil
Atom
Boy/Male
Czechoslovakian
Boy/Male
Hindu
Atom
Male
Japanese
(富) Japanese name TOMIO means "treasured man."
Boy/Male
Tamil
Atom
Boy/Male
Hindu, Indian
Relating to the Soul
Boy/Male
Hindu
The soul
Girl/Female
Hindu
Atom
Girl/Female
Indian
Atom
Boy/Male
Gujarati, Hindu, Indian
Topic; Subject
Boy/Male
African, Australian, Finnish, Japanese
The People; Twin; Happy Child
Girl/Female
Tamil
Anu Keerthi | அநà¯Â கிரதீ Â
Atom
Anu Keerthi | அநà¯Â கிரதீ Â
Girl/Female
Tamil
Atom
Male
Hungarian
Pet form of Hungarian Tamás, TOMI means "twin."
Girl/Female
Gujarati, Hindu, Indian, Marathi, Telugu
Sunrise; Comic
Girl/Female
British, English, French, Italian
Lovely
Boy/Male
Anglo Saxon
Horrible.
Boy/Male
Hindu
Atom
Boy/Male
Indian
An Atom's Warrior
Girl/Female
Hebrew
Strong as an oak.
ATOMIC MASS
ATOMIC MASS
Boy/Male
American, Australian, Christian, Hebrew, Jamaican
God's Helper; The Lord Helps Me; Salvation of God; God is Salvation
Girl/Female
English
Rhyming.
Boy/Male
Tamil
Girl/Female
Hindu, Indian, Tamil, Traditional
Honest
Girl/Female
Tamil
Kankalini | கநà¯à®•à®¾à®²à®¿à®¨à¯€
One with necklace of bones
Surname or Lastname
English
English : probably a variant of Clayton.
Girl/Female
Indian, Tamil
Love of Life
Girl/Female
Hindu, Indian, Kannada, Marathi
A Bird; Voice of Bird
Girl/Female
Indian, Punjabi, Sikh
Soul Beauty
Boy/Male
Indian
Intelligent, Beautiful
ATOMIC MASS
ATOMIC MASS
ATOMIC MASS
ATOMIC MASS
ATOMIC MASS
a.
Having two replaceable atoms or radicals.
a.
Characterized by atony, or want of vital energy; as, an atonic disease.
n.
One who holds to the atomic philosophy or theory.
n.
The doctrine of atoms. See Atomic philosophy, under Atomic.
n.
An atom; a mite; a pigmy.
n.
An Adonic verse.
a.
Pertaining to, or characterized by, aptotes; uninflected; as, aptotic languages.
a.
Of or pertaining to atoms; relating to atomism.
a.
Produced without sexual union; as, agamic or unfertilized eggs.
n.
Nomic spelling.
a.
Containing two atoms.
a.
Aeolian, 1; as, the Aeolic dialect; the Aeolic mode.
v. t.
To reduce to atoms.
a.
Pertaining to azote, or nitrogen; formed or consisting of azote; nitric; as, azotic gas; azotic acid.
v. t.
To reduce to atoms, or to fine spray.
a.
Relating to the etymon; as, an etymic word.
a.
Of or pertaining to atoms.
a.
Alt. of Atomical
a.
Unaccented; as, an atonic syllable.
n.
A tonic element or letter; a vowel or a diphthong.