as sodium has metallic bond in between there atoms which is a strong bond then why it is soft ?

Answer 1

Sodium only has one valence electron

Sodium only has one valence electron. So, in metallic bonding, it can only donate one electron to be delocalized throughout the structure.

In metallic bonding, the actual bonding is the electrostatic force between the positive cations and the delocalized electrons. Since there is only one electron for each ion, sodium as a pure metal is relatively soft, especially compared to other metals that have more than one valence electron.

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Answer 2

Xavier Avery

Sodium has strong metallic bonds, but it is soft because its atoms are arranged in layers that easily slide past one another under pressure, making it easy to deform or flatten sodium metal.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.