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Question

Give reasons:
(i) Ionization potential of element increases across a period.
(ii) Alkali metals are good reducing agents.

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Answer

(i) The ionization potential of element increases across a period because the atomic size decreases due to an increase in nuclear charge and electrons in the outermost shell are more strongly held because of which greater energy is required to remove the electron.

(ii) Alkali metals have one electron in their valence shell. In order to be stable, they easily lose this electron and get oxidized. Hence, they are good reducing agents.

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