elements A and B have atomic number 11 and 24 respectively . write their electronic configuration and predict group , period and block to which they belong . which of them is representative element ?

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Solution

Element A : Atomic number 11 : electronic configuration : 1s² 2s² 2p⁶ 3s¹
Group-1, Period-3, Block-S. Yes it is representative element. s-block and p-block elements are known as representative elements

Element B : Atomic number 24 : Electronic configuration : 1s² 2s² 2p⁶ 3s²3p⁶ 4s² 3d⁴
Group-6, period-4, Block-d. No it is not representative element.

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