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Give electronic configuration of calcium

i have a confusion that in electronic configuration the elctron will first enter in the lower energy shell than in the higher one so it will first enter 4snaa.. i m confused


Electronic configuration of calcium is 2,8,8,2 or [Ar] 4s2
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Pls! Mark as best....
yeah u are right
Pls! Mark as best padma
Configuration of calcium is 1s2 2s2 2p6 3s2 3p6 4s2
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