The ionization potentials of Li and K are 5.4 and 4.3 eV respectively. Ionization potential of Na will be:

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9.7 eV

1.1 eV

4.9 eV

7.9 eV

answer is C.

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Detailed Solution

Ionisation energy decreases in a group from top to bottom as atomic size increases. Li Na KI.P. (in eV) 5.4 4.9 4.3

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