Why are the metallic bonds in an alkali metal relatively weak? A. Alkali metals have low atomic mass. B. Alkali metals contribute only one valence electron. C. Alkali metals have a low ionization energy. D. Alkali metals’ outer energy levels are already full.

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Ferredoxin4 · Answer

Alkali metals are in group 1 and have only 1 VE for contribution, so they don't bond as well. That's why you can cut alkali metals with a knife.