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Question

Many elements have fractional atomic mass. This is because of :
  1. they have isotopes
  2. their isotopes have different masses
  3. neutrons, protons and electrons combine to give fractional masses
  4. their isotopes have non-integral masses

A
their isotopes have non-integral masses
B
their isotopes have different masses
C
they have isotopes
D
neutrons, protons and electrons combine to give fractional masses
Solution
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Several elements have isotopes with different atomic masses. Hence, many elements have fractional atomic masses.

Thus, options A and C are correct.

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