Name: Lithium Symbol: Li Atomic Number: 3 Atomic Mass: 6.941 amu Number of Protons/Electrons: 3 Number of Neutrons: 4 Date of Discovery: 1817 Discoverer: Johann Arfvedson Uses: batteries, ceramics, lubricants Classification: Alkali Metal
Potassium
Name: Potassium Symbol: K Atomic Number: 19 Atomic Mass: 39.0983 amu Number of Protons/Electrons: 19 Number of Neutrons: 20 Date of Discovery: 1807 Discoverer: Sir Humphrey Davy Uses: glass, soap Classification: Alkali Metal
Cesium
Name: Cesium Symbol: Cs Atomic Number: 55 Atomic Mass: 132.90546 amu Number of Protons/Electrons: 55 Number of Neutrons: 78 Date of Discovery: 1860 Discoverer: Fustov Kirchoff Uses: removes air traces in vacuum tubes Classification: Alkali Metal
Sodium
Name: Sodium Symbol: Na Atomic Number: 11 Atomic Mass: 22.98977 amu Number of Protons/Electrons: 11 Number of Neutrons: 12 Date of Discovery: 1807 Discoverer: Sir Humphrey Davy Uses: medicine, agriculture Classification: Alkali Metal
Rubidium
Name: Rubidium Symbol: Rb Atomic Number: 37 Atomic Mass: 85.4678 amu Number of Protons/Electrons: 37 Number of Neutrons: 48 Date of Discovery: 1861 Discoverer: R. Bunsen Uses: catalyst, photocells Classification: Alkali Metal
Francium
Name: Francium Symbol: Fr Atomic Number: 87 Atomic Mass: (223.0) amu Number of Protons/Electrons: 87 Number of Neutrons: 136 Date of Discovery: 1939 Discoverer: Marguerite Derey Uses: No uses known Classification: Alkali Metal