Question

When an $\alpha$-particle is emitted____________.

• A. element moves 2 places to the right in the periodic table
• B. element moves one place to the left
• C. element moves 2 places to the left in the periodic table
• D. elements maintains its position

Answer 1

The correct option is C element moves 2 places to the left in the periodic table

When $\alpha$ particle is emitted, the atomic number decreases by $2$. When atomic number decreases by $2$, the element moves $2$ places to left in periodic table as elements are arranged in increasing continuous order of atomic numbers. Thus correct answer is option C.