Question

Which one among the following contains the most neutrons?

• A. ${}_{26}^{59}Fe$
• B. ${}_{29}^{61}Cu$
• C. ${}_{30}^{61}Zn$
• D. ${}_{30}^{60}Z{n}^{2+}$

Answer 1

Answer: (A)

${}_{26}^{59}Fe$

No. of Neutrons = Atomic mass - Atomic number

${}_{26}^{59}Fe$ : neutrons = 59-26 =33

${}_{29}^{61}Cu$ : neutrons = 61-29 = 32

${}_{30}^{61}Zn$ : neutrons = 61-30 = 31

${}_{30}^{60}Z{n}^{2+}$ : neutrons = 60-30 = 30

Hence, ${}_{26}^{59}Fe$ has maximum neutrons.