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If aufbaus rule is not followed forCa-20will be placed in which block

 
If aufbaus rule is not followed forCa-20will be placed in which block 
 

Grade:11

2 Answers

Arun
25750 Points
5 years ago
Z=40Electronic configuration withou afbau principle1s^2 2s^2 2p^6 3s^2 3p^6 3d^2so the last electron enters in d orbital it should be dblock element
 
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Arun
Khimraj
3007 Points
5 years ago
Electronic configuration of Ca is 1s22s22p63s23p64s2
Filling of 3d orbital starts after the filling of 4s orbitals. If the aufbau principle had not been followed, the filling of 3d orbital would have been prior to filling of 4s orbital and the electronic configuration of Ca would have been 1s22s22p63s23p64s2  and it belongs to d block.

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