Question

Why is lithium harder than other alkali metals? With reason

Answer 1

Answer:

Lithium is not hard. It can be cut with a knife, as can all the common alkali metals in their pure metallic forms. Lithium is light mainly because it has a low atomic mass and low density. ... So it is harder and lighter dissimilar to other alkali metals in its group.

Answer 2

Explanation:

It is known that general property of metals is that they are hard in nature. And, the only exceptional case of alkali metals is sodium and potassium as they are soft in nature and can be easily cut with a knife.

Since, lithium is also an alkali metal so it is harder in nature. Atomic mass of lithium is 3 and it is the smallest element of group 1.

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