Which one among the following contains the most neutrons

• GC Atomic Structure

Which one among the following contains the most neutrons?

1. ⁶¹₂₉Cu
2. ⁵⁹₂₆Fe
3. ⁶⁰₃₀Zn²⁺
4. ⁶¹₃₀Zn

Answer

Neutrons = Atomic mass - Atomic number

In Fe, 59 - 26 = 36

In Cu, 61 - 29 = 32

In Zn, 61 - 30 = 31

In Zn²⁺, 60 - 30 = 30

The correct option is B.