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Question

The correct statement regarding the third orbit of hydrogen atom is:

A
It can accommodate maximum of nine electrons
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B
It contains nine degenerate atomic orbitals
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C
It contains nine atomic orbitals having three sets of degeneracy
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D
It contains nine sub-shells
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Solution

The correct option is B It contains nine degenerate atomic orbitals
The maximum number of electrons that can be accomodated in the third orbit of H atom is
2n2=2×9=18

In Hatom, the orbitals (five 3d, three 3p and one 3s) have same energy. So, they are called degenerate orbitals. Thus the third orbit of H- atom contains nine degenerate atomic orbitals.

The third orbit of H atom contains three sub - shells which are 3s, 3p and 3d respectively.

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