The ionization potentials of \( \mathrm{Li} \) and \( \mathrm{K} \)...

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The ionization potentials of \( \mathrm{Li} \) and \( \mathrm{K} \) are \( 5.4 \) and \( 4.3 \mathrm{eV} \) respectively. The ionization potential of \( \mathrm{Na} \) will be :
\( \mathrm{P} \)
(a) \( 9.7 \mathrm{eV} \)
(b) \( 1.1 \mathrm{eV} \)
(c) \( 4.9 \mathrm{eV} \)
(d) cannot be calculated
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