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achman (58)

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Olaaa!! Perrrfect answer. 10  [14 rates]

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You all have answered incorrectly.
The question is that energy of 3d level is lower than that of 4s level around Z=21.
Give reason for it
 this reply: 5 points  (with Olaaa!! Perrrfect answer.   in 1 votes )   [?]
 
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