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Question

The correct ground state configuration of Kr is:


  1. [Ar]344

  2. [Ar]344

  3. [Ar]443

  4. [Ar]344


Solution

The correct option is D

[Ar]344


The order in which the orbitals are filled is as follows:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s

Maximum number of electrons in s, p, d and f subshells are 2, 6, 10 and 14 respectively.
Now let's write the electronic configuration of [Ar].
Atomic Number of Ar is 18.
[Ar] = 1s2 2s2 2p6 3s2 3p6

Now by following Aufbau Principle, Pauli's exclusion principle and Hund's Rule, we can easily write the configuration.

Atomic number of Kr is 36.

Kr=[Ar]4s2 3d10 4p6

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