C3 Isotopes

Question 1

Isotopes

Answer 1

Same element containing same number of protons but different number of neutrons.

Question 2

A sample of magnesium contains 78.60% magnesium-24, 10.11% magnesium-25 and 11.29% magnesium-26

Answer 2

(78.60x24)+(10.11x25)+(11.29x26) / 100 = 24.3 (1.12)

Question 3

Abundance

Answer 3

The proportion of all the atoms that is a particular isotope.

Question 4

RAM formula

Answer 4

Because of isotopes the relative atomic mass is not always a whole number. It is linked to the mass of the isotopes and the abundance.
The relative atomic mass of an isotope = (% x isotope1) + (% isotope2) + (% x isotope3)… / 100