What is the electron configuration of Kr?

What is the electron configuration of Kr?

Answer: The electron configuration of Krypton is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶.

This configuration depicts the places where electrons orbiting the nucleus of a krypton atom are found when the atom is in its normal state. The number of electrons of the atom equals the atomic number which is 36 for Krypton thus Krypton has 36 electrons in its corresponding energy levels and sub-levels. Configuration is set according to the Aufbau principle, Pauli exclusion principle, and Hund’s rule. Progression is done starting from the 1s orbital and going to the outside, the number represents the energy level, letters s, p, d, and f denote the sub-level, while the ‘’superscripts show the number of electrons in the sub-level. The last one 4p⁶ suggests that the p-sublevel in the fourth energy level is filled with 10 electrons and this explains why krypton has noble gas characteristics. This set-up is perhaps the reason why krypton is relatively inert, and thus placed among the noble gases in the periodic table.