Question

Which one among the following contains the most neutrons?

(a) \(^ {59}_{26}Fe\)

(b) \(^ {61}_{29}Cu\)

(c) \(^ {61}_{30}Zn\)

(d) \(^ {60}_{30}Zn^ {2+}\)

Answer 1

(a) \(^ {59}_{26}Fe\)

Number of neutrons in an atom = mass number - atomic number

Number of neutrons in \(^ {59}_{26}Fe=33\)

Number of neutrons in \(^ {61}_{29}Cu=32\)

Number of neutrons in \(^ {61}_{30}Zn=31\)

Number of neutrons in \(^ {61}_{30}Zn^ {2+}=30\)

So, \(\frac{59}{26}Fe\) contains the most neutrons.