In a hydrogen atom,the electron is moving around the nucleus with a velocity of $2.18 \times 10^{6} \; m/s$ in an orbit of radius $0.528 \; \mathring{A}$. The acceleration of the electron is:
- A$9 \times 10^{18} \; m/s^{2}$
- B$9 \times 10^{22} \; m/s^{2}$
- C$9 \times 10^{-22} \; m/s^{2}$
- D$9 \times 10^{12} \; m/s^{2}$
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