Question 43

Hardness of IA-group elements gradually decreases down the group. Why?


Correct Answer: 0

Solution

PLACEHOLDER ANSWER - the answer is an explanation. Alkali metals have only one valence electron per atom for metallic bonding. Down the group the atomic size increases, so this electron is held farther from the nucleus and the metallic bonding becomes weaker. Weaker metallic bonds make the metals softer, so hardness decreases from Li to Cs.

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