chemicalelements.info

«N

Oxygen

F»
8
O
Oxygen
15.999

Properties

Symbol:O
Atomic Number:8
Atomic Weight:15.999
Density:1.429 g/dm3
Melting Point:
54K
-219°C
-362°F
Boiling Point:
90K
-183°C
-297°F

Electron Shells

2, 6

Oxygen (O) is a chemical element with atomic number 8. The most abundant oxygen isotope is 16O, 8 protons and 8 neutrons.

Oxygen is the most abundant element on Earth, and it's the third most abundant in the universe, after hydrogen and helium.

Being part of the water molecule, H2O, oxygen also makes up most of the mass of living organisms, such as humans.