Question

If the N/Z ratio of an atom is less than 1 then the nuclide is said to be stable. Here 'N' is the number of neutrons and 'Z' is the atomic number. Which of the following nuclides is stable?

• A. ${}^{3}He$
• B. ${}^{1}H$
• C. ${}^{3}He$ and ${}^{1}H$
• D. None of these

Answer 1

The correct option is C ${}^{3}He$ and ${}^{1}H$

For ${}^{3}He$
N = 1 and Z = 2
$\Rightarrow$N/Z is less than 1. Therefore, it is stable.

For ${}^{1}H$
N = 0 and Z = 1
$\Rightarrow$N/Z is less than 1. Therefore, it is also stable.