Question

Some of the elements have fractional atomic masses. The reason for this could be

• A. The existence of isobars
• B. The existence of isotopes
• C. The nuclear reactions
• D. The presence of neutrons in the nucleus

Answer 1

The correct option is B

The existence of isotopes

The explanation for the correct option: (B)

1. Isotopes are defined as the elements with the same atomic number but different mass numbers.
2. Many elements have isotopes that have different masses.
3. Thus elements have fractional atomic masses.

The explanation for the incorrect options:

(A) Some of the elements have fractional atomic masses due to the existence of isotopes.

(C) The given option is not correct. The elements have fractional atomic masses not because of the nuclear reactions.

(D) The presence of neutrons in the nucleus is not the reason for fractional atomic masses.

Hence option (B) is correct - Some of the elements have fractional atomic masses due to the existence of isotopes.