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Question

Which of the following orbitals are nearest to nucleus?

A
4f
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B
5d
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C
6s
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D
7p
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Solution

The correct option is C 6s

1. 4f is closer to nucleous and not 6s.

2. But still 6s fills first because aufbau rule states that electrons fill first in orbitals with lower energy (i.e. lower value of sum of principal quantum number and azimuthal quantum number).

3. Don't confuse with energy, the one with lower principal quantum number will be inner.


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