Friday, April 22, 2011

Chemistry Form 4: Chapter 4 - Reactivity of Group 1

Reactivity of Group 1 increases when go down the group.

  • When an alkali metal atom reacts, it loses an electron to form a singly positively charged ion which is a stable noble gases electron arrangement.
  • When go down the group, the atomic radius gets bigger due to an extra filled electron shell and the outer electron is further and further away from the nucleus.
  • Therefore the outer electron is less strongly held by the positive nucleus as the attractive force is decreased.
  • As a result, the outer electron is more easily lost and react more vigorously.

    Reaction of Group 1 with water

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