Question

# The correct ground state configuration of Kr is:[Ar]344 [Ar]344 [Ar]443 [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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