Multiple choice

Which of the following is a soft metal?

  1. Sodium

  2. Aluminium

  3. Iron

  4. Copper
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A Correct answer
Explanation

Sodium is a very soft metal that can be easily cut with a knife. It is an alkali metal with low hardness due to its large atomic radius and weak metallic bonding (single valence electron). Aluminium, Iron, and Copper are much harder metals used in structural applications. Sodium's softness is characteristic of Group 1 metals.

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