Question

The half-life periods of four isotopes are given I := 6.7 years; II = 8000 years; III = 5760 years; IV = $2.35\times {10}^5$ years. Which of these is most stable?

• A. I
• B. II
• C. III
• D. Iv

Answer 1

The correct option is D Iv

Higher the half-life period, higher will be the stability of substance.
IV have highest half-life so it is most stable.