Question

Why do group 1 metals decrease in hardness down the group?

Answer 1

Answer:

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The larger metal ions on the right have a lower charge density (effective nuclear charge) and are attracted to the 'sea' of negative electrons less than smaller ions. The result of this weaker bonding is a reduction in the melting point of the alkali metals on descending the group and also a decrease in the hardness.

Explanation:

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Answer 2

Answer:

The larger metal ions on the right have a lower charge density (effective nuclear charge) and are attracted to the 'sea' of negative electrons less than smaller ions. The result of this weaker bonding is a reduction in the melting point of the alkali metals on descending the group and also a decrease in the hardness.