Question

Many elements have non-integral atomic masses because

• A. They have isotopes
• B. Their isotopes have non-integral masses
• C. Their isotopes have different masses
• D. None of these

Answer 1

Answer: (A), (C)

Their isotopes have different masses

Non integral atomic masses of elements are due to existence of isotopes of that element which have different masses. And these isotopes occur in nature in different proportion.