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Question

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

A
they have isotopes
B
their isotopes have different masses
C
their isotopes have non-integral masses
D
the constituents, neutrons, protons and electrons combine to give fractional masses
Solution
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Elements have non integral atomic masses because isotopes are having different masses and are occur in the nature in different proportion.

Eg. Cl;z=17 and A=35 and 37. They are present in the ratio 3:1.

3×35+1×374=35.5 (A)

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