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Lanthanides Electronic Configuration

The atomic nu...

Question

The atomic number of an element in 35. What is the total number of electrons present in all the p-orbitals of the ground state atom of the element?

A

6

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B

11

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C

17

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D

23

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Solution

The correct option is B 17
According to Aufbau rule, the elctronic configuration is:
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{5}$
So, the number of p-orbital elctrons $= 17$

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