Question

Why ${}_{27}^{60}Co$ is radioactive ?

• A. Its atomic no. is high
• B. It has high $p/n$ ratio
• C. It has high $n/p$ ratio
• D. None of these

Answer 1

The correct option is C It has high $n/p$ ratio

Cobalt$-60$ is a synthetic radioactive isotope of cobalt with half life of $5.27$years. It is produced in reactors by neutron activation of bulk samples of monoisotopic cobalt. It has high neutron-proton ratio.