Atomic weight | Definition, Units, & Table | Britannica
网页5 天之前 · Atomic weight, ratio of the average mass of a chemical element’s atoms to some standard. Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12. Atomic weight is measured in …
The Definition of Atomic Mass or Weight in Chemistry - ThoughtCo
网页2019年12月7日 · Atomic mass, which is also known as atomic weight, is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally occurring element. Atomic mass indicates the size of an atom.
Atomic Weight Definition (Relative Atomic Mass) - ThoughtCo
网页2019年1月2日 · Atomic weight is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element. It is the weighted average of the masses of naturally-occurring isotopes.
The Difference Between Atomic Weight and Atomic Mass
网页2019年7月1日 · Atomic weight is a weighted average of the mass of all the atoms of an element, based on the abundance of isotopes. The atomic weight can change because it depends on our understanding of how much of each isotope of an element exists.
Atomic Weight and Atomic Mass - BYJU'S
网页Atomic weight, also called relative atomic mass, is the ratio of the total weight of the atoms of a chemical substance to a norm. The normal unit of atomic mass has been one-twelfth of the atomic mass of the carbon-12 isotope since 1961.
Atomic mass | Definition, Units, & Facts | Britannica
网页Atomic mass, the quantity of matter contained in an atom of an element. It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, which is assigned an atomic mass of 12 units. In this scale, 1 atomic mass unit (amu) corresponds to 1.66 x 10^−24 gram.
2.4: Atomic Weight - Chemistry LibreTexts
网页The relative masses of atoms are reported using the atomic mass unit (amu), which is defined as one-twelfth of the mass of one atom of carbon-12, with 6 protons, 6 neutrons, and 6 electrons. The atomic mass of an element is the weighted average of the masses of the naturally occurring isotopes.
2.6: Atomic Masses - Chemistry LibreTexts
网页2024年1月15日 · By calculating an average of an element’s atomic masses, weighted by the natural abundance of each isotope, we obtain a weighted average mass called the atomic mass (also commonly referred to as the atomic weight) of an element.
Mass Number Versus Atomic Number and Atomic Mass
网页2021年1月12日 · Atomic mass (atomic weight) is the average number of protons and neutrons in a sample of an element. It is a number calculated based on the natural abundance of isotopes of an element, so it doesn’t have to be a whole number.
Atomic and Molecular Weights | Brilliant Math & Science Wiki
网页Atomic weight is a common name for relative atomic mass, which is defined as the ratio of the average mass of one atom of an element to \(\frac{1}{12}\) of the mass of an atom of carbon-12.
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