The relative atomic mass of chlorine is not a whole number because
- it is the weighted average mass of all its various isotopes
-
it is the average mass of all the isotopes of the element
- the element has strong oxidizing ability
- the atom contains a higher number of neutrons than protons
The correct answer is: B
Explanation
Chlorine is a mixture of two isotopes with different abundances. Its relative atomic mass is the mean or average of the isotopic masses.