Problem: Consider the following three pairs of species:I. 55Fe3+ and 56Fe2+II. Na+ and NeIII. 13C and 14CWhich of the following statements is  NOT true? A) I and III both contain pairs of isotopes.B) II shows two species with different number of electrons.C) III shows two species with different mass numbers, but the same atomic numbers.D) I shows two species with the same number of protons.

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Problem Details

Consider the following three pairs of species:

I. 55Fe3+ and 56Fe2+

II. Na+ and Ne

III. 13C and 14C

Which of the following statements is  NOT true?

A) I and III both contain pairs of isotopes.

B) II shows two species with different number of electrons.

C) III shows two species with different mass numbers, but the same atomic numbers.

D) I shows two species with the same number of protons.

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