Question

During the distribution of electrons, the shells are filled in step wise manner . Select the option which indicates the way order in which the shells are filled.

A

Innermost shells to outermost shells

B

Outermost shells to innermost shells

C
Middle shells first and then inner and outer shells alternatively
D
Shells are filled in random

Solution

The correct option is D Innermost shells to outermost shells According to Bohr and Bury models, the electrons are not accommodated in outer shells, unless the inner shells are filled. i.e. the shells are filled in a step-wise manner from the inner-most orbits to the outer-most orbit. Chemistry

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