Question

The relative atomic masses of many elements are not whole numbers because :

• A. they cannot be determined very accurately
• B. the atoms ionize during the determinations
• C. of the existence of isotopes
• D. of the presence of impurities

Answer 1

Answer: (C)

of the existence of isotopes

For an element, relative atomic mass is the average of the masses of its isotopes and for the mass of isotopes their percentage abundance is taken into account.