The softness of group 1 elements increases down the group with i

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The s-Block Elements

Short Answer Type

1. What are s-block elements?

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2.

Why are alkali metals not found in nature?

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3.

Lithium shows similarities to magnesium in the chemical behaviour. What is the cause of this similarity?

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4.

What is the nature of lithium compounds?

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5.

Group 1 elements are called alkali metals. Why?

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6.

Why caesium can be used in photoelectric cell while lithium can not be?

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7.

In aqueous solution, Li⁺ ion has lowest mobility. Why?

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8.

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

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9.
The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

The extent of metallic bonding decreases with the increase in atomic size down the group. In other words, close-packing of atoms in crystal lattice decreases from Li to Cs, thereby resulting in an increased softness.

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10.

Which is the most reactive alkali metal and why?

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