If $P.E.$ of $3^{rd}$ shell is $-20 \ eV/atom$,then find the $I.P.$ of the $3^{rd}$ shell of that element.
- A$-20 \ eV/atom$
- B$1.6 \times 10^{-18} \ J/atom$
- C$10 \ eV/atom$
- D$3.2 \times 10^{-18} \ J/mole$
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