Chemical Elements.com - Krypton (Kr)

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Basic Information

Name: Krypton
Symbol: Kr
Atomic Number: 36
Atomic Mass: 83.8 amu
Melting Point: -157.2 °C (115.950005 K, -250.95999 °F)
Boiling Point: -153.4 °C (119.75001 K, -244.12 °F)
Number of Protons/Electrons: 36
Number of Neutrons: 48
Classification: Noble Gas
Crystal Structure: Cubic
Density @ 293 K: 3.74 g/cm³
Color: colorless gas

Atomic Structure

Number of Energy Levels: 4

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Isotopes

Isotope	Half Life
Kr-78	Stable
Kr-79	1.45 days
Kr-80	Stable
Kr-81	210000.0 years
Kr-82	Stable
Kr-83	Stable
Kr-83m	1.86 hours
Kr-84	Stable
Kr-85	10.73 years
Kr-85m	4.48 hours
Kr-86	Stable
Kr-87	1.27 hours
Kr-88	2.84 hours
Kr-89	3.15 minutes
Kr-90	32.3 seconds

Facts

Date of Discovery: 1898
Discoverer: Sir William Ramsay
Name Origin: From the Greek word kryptos (hidden)
Uses: Lighting
Obtained From: production of liquid air

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