Krypton (Kr) – Periodic Table [Element Information & More]

Krypton element (Kr) is in group 18 and period 4 of a periodic table. Krypton is in the p-block and it is classified as a noble gas element on the periodic table.

There is a lot more information related to krypton which is mentioned in the Information Table given below.

So let’s dive right into it!

Table of contents

• Krypton element (Information Table)
• Krypton element in Periodic table
• Facts about Krypton
• Properties of Krypton
• Uses of Krypton

Krypton Element (Information Table)

The important data related to krypton element is given in the table below.

Appearance of krypton	Colorless gas
Atomic number of krypton	36
Symbol of krypton	Kr
Atomic mass of krypton	83.798 u
Protons, Neutrons & Electrons in krypton	Protons: 36, Neutrons: 48, Electrons: 36
State of krypton (at STP)	Gas
Group number of krypton in periodic table	18
Period number of krypton in periodic table	4
Block of krypton in periodic table	p-block
Category of krypton	Noble gas
Bohr model or Electrons per shell or Electrons arrangement in krypton	2, 8, 18, 8
Electron configuration of krypton	[Ar] 3d10 4s2 4p6
Orbital diagram of krypton
Valence electrons in krypton	8
Electronegativity of krypton (on pauling scale)	3.00
Atomic radius of krypton (van der Waals radius)	202 picometers
Density of krypton	3.75 g/L
1st ionization energy of krypton	14.00 eV
Main isotope of krypton	84Kr
Melting point of krypton	115.7 K or -157.3 °C or -251.2 °F
Boiling point of krypton	119.9 K or -153.4 °C or -244.1 °F
Crystal structure of krypton	Face Centered Cubic (FCC)
Discovery of krypton	By William Ramsay and Morris Travers in 1898

Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).

Krypton element in Periodic table

The Krypton element (Kr) has the atomic number 36 and is located in group 18 and period 4. Krypton is a nonmetal and it is classified as a noble gas element.

Click on above elements in the periodic table to see their information.

Facts about krypton

Here are a few interesting facts about krypton element.

1. Krypton is named after the Greek word “kryptos” (which means hidden).
2. Earth’s atmosphere contains very less quantity of krypton (around 1 ppm by volume).
3. Krypton is also present in the atmosphere of Mars (with the concentration of only 0.3 ppm).
4. Krypton is obtained from the fission of uranium.
5. Krypton glows with a smoky white light when it is exposed to electric current under low pressure.

Properties of krypton

Here is a list of some physical properties and chemical properties of krypton.

Physical properties of krypton

• Krypton is colorless, odorless and tasteless gas.
• The melting point and boiling point of krypton is 115.7 K and 119.9 K respectively.
• Krypton has an atomic mass of 83.798 u and its density is 3.75 g/L.
• Krypton has FCC crystal structure.
• There are many stable isotopes as well as synthetic isotopes and out of these isotopes, the most abundant isotope is ⁸⁴Kr.
• The van der Waals atomic radius of the krypton atom is 202 pm.

Chemical properties of krypton

• Krypton has an electron shell arrangement: 2, 8, 18, 8. This indicates that it has a stable octet and it is chemically inert.
• Krypton is chemically inert gas and so it does not have more chemical properties.
• Krypton reacts with highly reactive fluorine element under certain conditions to form krypton difluoride.

Uses of krypton

Here are some uses of the krypton element.

• Krypton gas is filled in incandescent bulbs which protects the filament from oxidation.
• The isotope of krypton (⁸¹Kr), is used to determine the age of ice of polar regions.
• One of the isotopes of krypton is also used in some applications in MRI technology.
• Krypton is also used in double glazed windows which acts as a thermal insulation.
• Krypton is also used for flashes in photography (because krypton can produce bright white light).

External resources:

1. Krypton – American Chemical Society. (2018, December 3). American Chemical Society. https://www.acs.org/molecule-of-the-week/archive/k/krypton.html
2. Krypton – Element information, properties and uses | Periodic Table. (n.d.). Krypton – Element Information, Properties and Uses | Periodic Table. https://www.rsc.org/periodic-table/element/36/krypton
3. Bondi, A. (1964, March). van der Waals Volumes and Radii. The Journal of Physical Chemistry, 68(3), 441–451. https://doi.org/10.1021/j100785a001
4. Holden, et al. (2018, December 1). IUPAC Periodic Table of the Elements and Isotopes (IPTEI) for the Education Community (IUPAC Technical Report). Pure and Applied Chemistry, 90(12), 1833–2092. https://doi.org/10.1515/pac-2015-0703
5. Zhang, et al. (2011, January 11). Corrected Values for Boiling Points and Enthalpies of Vaporization of Elements in Handbooks. Journal of Chemical & Engineering Data, 56(2), 328–337. https://doi.org/10.1021/je1011086
6. Periodic Table of Elements: Los Alamos National Laboratory. (n.d.). Periodic Table of Elements: Los Alamos National Laboratory. https://periodic.lanl.gov/36.shtml
7. Atomic Weight of Krypton | Commission on Isotopic Abundances and Atomic Weights. (n.d.). Atomic Weight of Krypton | Commission on Isotopic Abundances and Atomic Weights. https://ciaaw.org/krypton.htm
8. Atomic Data for Krypton (Kr). (n.d.). Atomic Data for Krypton (Kr). https://physics.nist.gov/PhysRefData/Handbook/Tables/kryptontable1.htm
9. Prohaska, T., et al. (2022, May 1). Standard atomic weights of the elements 2021 (IUPAC Technical Report). Pure and Applied Chemistry, 94(5), 573–600. https://doi.org/10.1515/pac-2019-0603
10. Haynes, W. M. (Ed.). (2014, June 4). CRC Handbook of Chemistry and Physics. https://doi.org/10.1201/b17118
11. Kaye, G W.C., & Laby, T H. Tables of physical and chemical constants. 15th Edition. United States.
12. Sansonetti, J. E., & Martin, W. C. (2005, December). Handbook of Basic Atomic Spectroscopic Data. Journal of Physical and Chemical Reference Data, 34(4), 1559–2259. https://doi.org/10.1063/1.1800011
13. Krypton | Kr | ChemSpider. (n.d.). Krypton | Kr | ChemSpider. http://www.chemspider.com/Chemical-Structure.5223.html?rid=0b3b243a-23a1-46c4-8025-11090442f1ad
14. Krypton – Wikipedia. (2016, June 23). Krypton – Wikipedia. https://en.wikipedia.org/wiki/Krypton
15. P. (n.d.). Krypton | Kr (Element) – PubChem. Krypton | Kr (Element) – PubChem. https://pubchem.ncbi.nlm.nih.gov/element/Krypton
16. It’s Elemental – The Element Krypton. (n.d.). It’s Elemental – the Element Krypton. https://education.jlab.org/itselemental/ele036.html