Which of the following has the lowest ionization energy?

L i

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N a

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K

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R b

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C s

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Solution

The correct option is E $C s$
The first ionisation energy decreases on going down a group. This is because the electron to be removed from the outer energy level is increasingly distant from the nucleus, as a result of the atoms getting bigger. The attraction of the nucleus for the electron becomes less, and it becomes easier to pull it away.

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The correct order of reactivity of alkalimetals towards $H_{2}$ is

C s, N a, L i, K, R b

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