MCQ
An atom with atomic number $21$ belongs to the category of
- A$s$-block elements
- B$p$-block elements
- ✓$d$-block elements
- D$f$-block elements
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[Given : mass of electron $=9.1 \times 10^{-31} \mathrm{~kg}$, Plank's constant $(\mathrm{h})=6.626 \times 10^{-34} \mathrm{JS}$ ]
(Value of $\pi=3.14$ )