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  • Write down the outermost electronic configuration of alkali metals. How will you justify their placement in group 1 of the periodic table?

Write down the outermost electronic configuration of alkali metals. How will you justify their placement in group 1 of the periodic table?

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All the elements of Alkali metals have the similar outer electronic configuration, i.e. ns1 where n refers to the number of principle shell. These electronic configuration are given below.

_{3}Li\; \; \; \; \; \; 1s^{2}2s^{1}or\left [ He \right ]2s^{1}

_{11}Na\; \; \; \; \; \; 1s^{2}2s^{2}2p^{6}3s^{1}or\left [ Ne \right ]3s^{1}

_{19}K\; \; \; \; \; \; 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}or\left [ Ar \right ]4s^{1}

_{37}Rb\; \; \; \; \; \; 1s^{2}2s^{2}2p^{6}3s^{1}3p^{6}3d^{10}4s^{2}4p^{6}5s^{1}or\left [ Kr \right ]5s^{1}

_{55}Cs\; \; \; \; \; \; 1s^{2}2s^{2}2p^{6}3s^{1}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}5s^{2}5p^{6}6s^{1}or\left [ Xe \right ]6s^{1}

_{87}Fr\; \; \; \; \; \; \left [ Rn \right ]7s^{1}

Hence, placement of all the elements in group 1 of the periodic table because of similarity in electronic configuration and all the elements have similar properties.

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