Asked by vk1994 | 5th Sep, 2010, 08:49: AM

Expert Answer:

Alkaline earth metals have smaller size compared to alkali metals. This causes them to be more closely packed in their crystal lattices. They also have two electrons per metal atom in their valence shell (as compared to one for the alkali metals) forming strong metallic bonds for binding the atoms in the crystal lattice of the metal Therefore they are harder.
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Answered by  | 6th Sep, 2010, 10:41: AM

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