Question

When an $\alpha$-particle is removed from $Ra$, the new element formed is of

• A. zero group
• B. I st group
• C. VII th group
• D. III rd group

Answer 1

Answer: (A)

zero group

Answer 2

$\underset{\text{Radium}}{_{88}Ra^{226}} \to \underset{\text{Radon}}{_{86}Rn^{222} }+ \,_{2} He^{4}$ Therefore, by removing a-particle from Radium, the new element formed is Radon which belongs to zero group.