Periodic Table

Alkali Metals

6.941

Name: Lithium
Symbol: Li
Atomic Weight: 6.941
Atomic Number: 3
Element Classification: Alkali Metal
Discovered By: Johann Arfwedson
Discovery Date: 1817 (Sweden)
Name Origin: Greek: lithos (stone).

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Sodium

22.989768

Name: Sodium
Symbol: Na
Atomic Weight: 22.989768
Atomic Number: 11
Element Classification: Alkali Metal
Discovered By: Sir Humphrey Davy
Discovery Date: 1807 (England)
Name Origin: Medieval Latin: sodanum, (headache remedy); symbol from Latin natrium, (sodium carbonate).

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Potassium

39.0983

Name: Potassium
Symbol: K
Atomic Weight: 39.0983
Atomic Number: 19
Element Classification: Alkali Metal
Discovered By: Sir Humphrey Davy
Discovery Date: 1807 (England)
Name Origin: English: pot ash; symbol from Latin: kalium, (alkali).

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Rubidium

85.4678

Name: Rubidium
Symbol: Rb
Atomic Weight: 85.4678
Atomic Number: 37
Element Classification: Alkali Metal
Discovered By: R. Bunsen, G. Kirchoff
Discovery Date: 1861 (Germany)
Name Origin: Latin: rubidus (deep red); the color its salts impart to flames.

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Cesium

132.90543

Name: Cesium
Symbol: Cs
Atomic Weight: 132.90543
Atomic Number: 55
Element Classification: Alkali Metal
Discovered By: Gustov Kirchoff, Robert Bunsen
Discovery Date: 1860 (Germany)
Name Origin: Latin: coesius (sky blue); for the blue lines of its spectrum.

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Francium

223.0197

Name: Francium
Symbol: Fr
Atomic Weight: 223.0197
Atomic Number: 87
Element Classification: Alkali Metal
Discovered By: Marguerite Derey
Discovery Date: 1939 (France)
Name Origin: Named for France, the nation of its discovery.

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