Question

Account for the fact that the 4th period has 18 and not for 8 element​

Answer 1

Answer:

ello

gud evning

hru

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After the filling of 4s orbital, instead of 4p orbitals, there starts the filling 3d orbitals. This is in keeping with the fact that 3d orbitals have less energies than 4p orbitals. Thus 10 elements are built up by the filling of 3d orbitals. ... Hence the fourth period consists up of 18 and not 8 elements.

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Answer 2

Hii

how are you?

hope your fine

and mujhe bhul tho nhi geye na??

anyway good night take care