Periodic System for Chemists

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Alkali Metals

Highly reactive metals that form strong bases when combined with water. Found in Group 1 of the periodic table.

Discovery Period: Early 19th century (1807-1939)

Characteristics

  • • Soft, silvery metals
  • • Highly reactive with water
  • • Low melting and boiling points
  • • Single electron in outer shell
  • • Form +1 ions readily
  • • Excellent conductors of heat and electricity

Elements (6)

3
Li
Lithium
11
Na
Sodium
19
K
Potassium
37
Rb
Rubidium
55
Cs
Cesium
87
Fr
Francium

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