Saturday, April 16, 2011

Chemistry Form 4: Chapter 4 - Physical Properties of Group 1 Elements

  • Group 1 elements are soft metal and can be cut with a knife

  • Silvery grey surface

  • Low density compared to other metals

  • Lower melting and boiling points than most other metals
As the atomic radius increases, the charges are further apart and the electrical attractive force is reduced. This results a weaker metallic bond and little heat energy is needed to overcome the bond. Thus, the melting/boiling point decreases as we go down the group.

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