Tabla

Electronic ConfigurationAr 4s2 3d10 4p6

Melting Point-1.5640x10²°C

Boiling Point-1.5215x10²°C

Density2.155g cm⁻³

Description

Colorless gaseous element, belongs to the noble gases. Occurs in the air, 0.0001% by volume. It can be extracted from liquid air by fractional distillation. Generally not isolated, but used with other inert gases in fluorescent lamps. Five natural isotopes, and five radioactive isotopes. ⁸⁵Kr, the most stable radioactive isotope, has a half-life of 10.76 years and is produced in fission reactors. Practically inert, though known to form compounds with Fluorine.

Covalent Radius117pm

Double121pm

Triple108pm

Ionisation Energies

Oxidation States0

Uses

Used in lighting products. Some is used as inert filler-gas in incandescent bulbs. Some is mixed with Argon in fluorescent lamps. The most important use is in flashing stroboscopic lamps that outline airport runways.

Proton Affinity424.6kJ mol⁻¹

Atomic Volume32.2cm³ mol⁻¹

Van Der Waals Radius202pm

Sources

Forms 1 millionth of the atmosphere. Obtained from production of liquid air.

Discovery

Discovered in 1898 by Sir William Ramsey, M.W. Travers in Great Britain

Name Origin

Greek: kryptos (hidden).

CAS7439-90-9

Crust Abundance0.0001mg kg⁻¹

Sea Abundance0.00021mg dm⁻³

Enthalpy of Vapourisation 9.05kJ mol⁻¹

Specific Heat - 20°C0.247J (g ⋅ K)⁻¹

Thermal Conductivity0.0095W (m ⋅ K)⁻¹

Isotope	Abundance	Half Life
78Kr	0.355%	-
80Kr	2.286%	-
82Kr	11.59%	-
83Kr	11.5%	-
84Kr	56.99%	-
86Kr	17.28%	-
85Kr	-	-

https://reuben.science

https://github.com/reubn/tabla

Using data from mendeleev.

MIT License Copyright (c) 2020 reubn Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. pb2bb3a9eb2b62a1fdf94