What deos atomic mass mean?

Answer 1

After the IUPAC rules, Atomic Mass is an expression used only for the mass of isotopes (in Atomic Mass units).

Answer 2

the atomic mass is how heavy one mole of the substance would be, it takes into account only the mass of the protons and the neutrons, as the mass of the electrons is insignificant
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

Answer 3

I assume you mean relative atomic mass, which is the average atomic mass of an atom of the element. Atoms of a particular element will usually have several isotopes. An isotope is an atom where the number of neutrons is specified as well as protons, e.g. "carbon-13" is a radioactive isotope of carbon with an atomic mass of 13 because it has 6 protons and 7 neutrons.

The relative atomic mass of an element is calculated by adding together the sum of each atomic mass multiplied by its proportion.

Relative atomic mass = (m1 * p1) + (m2 *p2) + (m3 * p3) + ... where m = atomic mass of isotope and p = proportion of isotope.

e.g. element X is has following isotopes:

20% have a mass of 30

0.3 have a mass of 31

1/2 have a mass of 32

Relative atomic mass = (30 * 0.2) + (31 * 0.3) + (32 * 0.5)

= 31.3

So the average atom will have a mass of 31.3 atomic units.

Answer 4

The Atomic Mass is the weighted average mass of the isotopes of an element

Answer 5

it tells the weight of ine atom in the element

Answer 6

atomic mass is the number of protons in the nucleus of an atom.It can also be equal to the number of electrons in a neutral atom

Answer 7

mass in a atom