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moongazer
 2 years ago
Best ResponseYou've already chosen the best response.0I think it is because of their energy level

ArkGoLucky
 2 years ago
Best ResponseYou've already chosen the best response.0I mean before 3d is 4s so why not 4d?

shubham.bagrecha
 2 years ago
Best ResponseYou've already chosen the best response.1electrons are filled in increasing order of energies, in accordance to the aufbau principle. According to it the filling of electron is governed by "n+l" rule and "n" rule. for 3d orbital, n+l = 3+2 = 5 for 4s orbital, n+l = 4+0 = 4 since the n+l value of 4s is less than that of 3d , 4s is filled first. See the atttachment for order of filling electrons.
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