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15 April, 19:32

1. Which of the following pairs of atoms are isotopes?

a) K-39 and K-40

c) C-12 and N-14

b) F-10 and Ne-10

d) H-2 and He-2

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Answers (1)
  1. 15 April, 20:48
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    Isotopes of an element are atoms of the same element with same number of protons but different number of neutrons. Only choice (b) has 2 atoms of X with 6 protons and 8 and 6 neutrons respectively.

    Explanation:

    b) is the answer
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