The Physical Properties of Alkili Metals

Specification Point 6.2:
  • Recall that alkali metals:
    a) are soft
    b) have relatively low melting points
  • The Group 1 metals are also called the alkali metals as they form alkaline solutions with high pH values when reacted with water.
  • The Group 1 metals are lithium, sodium, potassium, rubidium, caesium and francium.

PT Group 1, Edexcel GCSE Chemistry

The alkali metals lie on the far left-hand side of the Periodic table

  • The Group I metals:
    • Are soft and easy to cut, getting softer as you move down the Group due to increasing density (except for potassium which fluctuates).
    • The first three alkali metals are less dense than water.
    • They all have relatively low melting points which decreases as you move down the Group due to decreasing electrostatic forces.

MP Group 1, Edexcel GCSE Chemistry

The melting point of the Group 1 metal decreases moving down the group

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Morgan Curtin Chemistry

Author: Morgan

Morgan’s passion for the Periodic Table begun on his 10th birthday when he received his first Chemistry set. After studying the subject at university he went on to become a fully fledged Chemistry teacher, and now works in an international school in Madrid! In his spare time he helps create our fantastic resources to help you ace your exams.