Group 1 Properties

• Lithium

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  Symbol: Li

  Atomic No: 3

  Atomic Mass: 7

  Boiling Point: 1347 C

  Melting Point: 181 C
• Sodium

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  Symbol: Na

  Atomic No: 11

  Atomic Mass: 23

  Boiling Point: 883 C

  Melting Point: 98 C
• Potassium

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  Symbol: K

  Atomic No: 19

  Atomic Mass: 39

  Boiling Point: 774 C

  Melting Point: 64 C
• Rubidium

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  Symbol: Rb

  Atomic No: 37

  Atomic Mass: 85

  Boiling Point: 688 C

  Melting Point: 39 C
• Cesium

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  Symbol: Cs

  Atomic No: 55

  Atomic Mass: 133

  Boiling Point: 678 C

  Melting Point: 28 C
• Francium

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  Symbol: Fr

  Atomic No: 87

  Atomic Mass: 223

  Boiling Point: 677 C

  Melting Point: 27 C
• Reaction Formula

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  • Lithium + Water = 2Li + 2H₂O -> 2LiOH + H₂
  • Sodium + Water = 2Na + 2H₂O -> 2NaOH + H₂
  • Potassium + Water = 2K + 2H₂O -> 2KOH + H₂
  • Rubidium + Water = 2Rb + 2H₂O -> 2RbOH + H₂
  • Cesium + Water = 2Cs + 2H₂O -> 2CsOH + H₂
  • Francium + Water = 2Fr + 2H₂O -> 2FrOH + H₂
• Trends Of Group 1

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  • As we go down the group, the atomic no will increase. This tells us the size of the atom
  • As we go down the group, the atomic mass will increase. This tells us the weight of an atom
  • As we go down the group, the boiling point will decrease
  • As we go down the group, the melting point will decrease