Krypton (Kr)

About Krypton

Krypton is a chemical element with the symbol Kr and atomic number 36, meaning every atom has 36 protons in its nucleus. It is classed as Noble gas and is a gas at room temperature. Its atomic mass is about 83.798 atomic mass units (u).

On the periodic table, Krypton sits in group 18, period 4, which determines how many electron shells it has and how it tends to react with other elements.

Uses of Krypton

In daily life and industry, Krypton is used for Flash lamps. These uses are closely tied to the typical properties of elements in the Noble gas category.

Electron Structure of Krypton

Using a simplified electron shell model (at most 2 electrons in the first shell, 8 in the second, 18 in the third, and so on), Krypton has 4 electron shells, with an approximate arrangement of 2, 8, 18, 8 electrons from the innermost shell to the outermost. This is a simplified learning model, not the full electron configuration that accounts for the s, p, d and f subshells.

Explore Other Elements

Want to see another element or try the element symbol quiz? Go back to the Interactive Periodic Table to explore all 118 chemical elements.

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