Element Highlights

Discovered: 1774 by Joseph Priestley & Carl Wilhelm Scheele

Valence Electrons: 6

Ionization Energy: 1314 kJ/mol

Electron Affinity: −141 kJ/mol

Electronegativity: 3.44

Atomic Radius: 48 pm

Isotopes: O-16 (99.76%), O-17 (0.04%), O-18 (0.20%)

Interesting Fact: Oxygen makes up about 21% of Earth's atmosphere and is essential for life.

Discovered: 1807 by Humphry Davy

Valence Electrons: 1

Ionization Energy: 419 kJ/mol

Electron Affinity: 48 kJ/mol

Electronegativity: 0.82

Atomic Radius: 227 pm

Isotopes: K-39 (93.26%), K-40 (0.01%), K-41 (6.73%)

Interesting Fact: Potassium is essential for nerve function and found in bananas.