The I.P. of sodium is 5.14 eV. The I.P. of potassium could be :

same as that of sodium

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5.68 eV

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4.34 eV

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10.28 eV

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Solution

The correct option is A 4.34 eV
I.P decreases on going down the group as size increases and the outer electrons experience less effective nuclear charge. Therefore, I.P of $K < N a$ .

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I P_{1^{'}} I P_{2^{'}} I P_{3^{'}} I P_{4^{'}}

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7.1, 14.3, 34.5, 46.8, 162.2

I P_{1}, I P_{2}, I P_{3}

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7.5 e V, 25.6 e V, 48.6 e V

170.6 e V

The IP1, IP2, IP3, IP4 and IP5 of an element are 7.1, 14.3, 34.5, 46.8, 162.2 eV respectively. The element is likely to be -

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