Lithium is harder than other alkali metals because of :

Weak Van der Waals forces

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Strong metallic bonds

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Weak metallic bonds

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Both A and C

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Solution

The correct option is B Strong metallic bonds
Li has anomalous properties due to very small size and high polarizing power. Lithium is much harder than the other alkali metals due to strong metallic bonds.

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Their teacher explained that their measurement was correct by saying that the recorded values are

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Lithium is harder than other alkali metals because of :

The correct option is B Strong metallic bondsLi has anomalous properties due to very small size and high polarizing power. Lithium is much harder than the other alkali metals due to strong metallic bonds.

The correct option is B Strong metallic bonds
Li has anomalous properties due to very small size and high polarizing power. Lithium is much harder than the other alkali metals due to strong metallic bonds.