Symbol
Kr
Atomic Number
36
Atomic Mass
83.798
Protons
36
Neutrons
48
Electrons
36
Type
Noble Gas
Isotopes
Krypton-78, Krypton-80, Krypton-82, Krypton-83, Krypton-84
Discovery Year
1898
Discovered By
William Ramsay, Morris Travers
Group
18
Period
4
Boiling Point
-157.36°F
Melting Point
-244.11°F
Electron Configuration
[Ar] 3d¹⁰ 4s² 4p⁶
Density (g/cm³)
3.733
Crystal Structure
Face-centered cubic
Magnetism
Diamagnetic
Abundance in Earth's Crust
0.0001%
Phase at Room Temperature
Gas