how is that?
2007-07-10 18:48:03 · 3 answers · asked by simdawgydawg 2 in Science & Mathematics ➔ Chemistry
The atomic mass as stated on the periodic table is a weighted average of all the isotopes and their abundance.
2007-07-11 07:00:47 · answer #1 · answered by science teacher 7 · 0⤊ 0⤋
If you have isotope data, that means you know the following: the atomic mass of each isotope and its relative abundance (in percent). The elemental mass is the weighed average of the isotope's atomic masses: the mass of each times it relative abudance, all added together. For example, if element A has 3 isotopes with masses A1, A2 and A3, and the relative abundance of A1 is X%, A2 is Y% and A3 is Z%, then its atomic mass would be
(X/100)*A1 + (Y/100)*A2 + (Z/100)*A3
2007-07-10 19:01:11 · answer #2 · answered by gp4rts 7 · 0⤊ 0⤋
an isotope of an atom has extra or is deficient neutrons...
you can add or subtract the atomic mass of a neutron as many times as necessarry to come up with the atomic mass of an element as it would appear on the periodic table
2007-07-10 18:53:54 · answer #3 · answered by bluecuriosity 2 · 0⤊ 0⤋