Nitrogen (N)

Nitrogen is a chemical element with symbol N and atomic number 7. It was discovered by Daniel Rutherford in 1772. About 78% of Earth's atmosphere is nitrogen.

Atomic Number

7

Atomic Mass

14.007 u

Category

nonmetal

Phase

gas

Density

0.0012506 g/cm³

Electron Shells

2, 5

Atomic Structure

Protons: 7 • Electrons: 7 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p³

Discovery

1772 • Daniel Rutherford