Question

The transuranic element with the longest half-life is:

• A. $N{p}^{237}$
  
• B. $P{u}^{239}$
• C. $A{m}^{243}$
• D. $C{m}^{247}$

Answer 1

The correct option is B $P{u}^{239}$

$P{u}^{239}$ has longest half-life of $2.4\times {10}^4$ years among all transuranic element.