01 About Nitrogen
Makes up 78% of Earth's atmosphere. Liquid nitrogen at -196ยฐC is used to preserve biological samples and in food freezing.
02 Physical Properties
State at room temperature๐จ Gas
Melting point-210 ยฐC
Boiling point-195.8 ยฐC
Density0.00125 g/cmยณ
Atomic mass14.007 u
Electron configuration2,5
Period / GroupPeriod 2, Group 15
BlockP-block
03 Discovery
Nitrogen was discovered in 1772 by Rutherford D..