1)..Which one of the following is a correct electrons configuation of sodium? a)2,8 b) 8,2,1 c) 2,1,8 d) 2,8,1
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Option (d): since the atomic number of sodium is 11 and K, L, M shells can have maximum 2, 8, 18 electrons respectively. Therefore the correct electronic configuration of sodium is 2, 8, 1 where K shell has 2 electron, L shell has 8 electrons, M shell has 18 electrons. Therefore this option is correct.
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