Question

The total number of neutrons in dipositive zinc ions with mass number 70 is

• A. 34
• B. 40
• C. 36
• D. 38

Answer 1

Answer: (B)

40

Answer 2

$30Zn^{70},Zn^{2 +}$ has No. of Neutrons = 70 – 30 = 40.