(a) Arrange the following species in increasing order of their ionic s

1.	(a) Arrange the following species in increasing order of their ionic size: N3-,Na+, F-, O2- (b) How does atomic radius vary in a period and in a group? How do you explain the variation?
Answer» (a) The species N³⁻, O²⁻, F⁻,Na⁺ in their increasing order of ionic radii: Na⁺ < F⁻< O²⁻ < N³⁻ (b) Across the period-Atomic radii decrease on account of the following facts: Nuclear charge increases progressively by one unit but the additional electron goes to the same principal shell. As a result, the electron cloud is pulled closer to the nucleus by the increased effective nuclear charge. Across the group: Atomic radii increase Reason: Nuclear charge increases with increase in atomic numbers but at the same time, there is progressive increase in principal energy levels.

(a) Arrange the following species in increasing order of their ionic size: N3-,Na+, F-, O2- (b) How does atomic radius vary in a period and in a group? How do you explain the variation?

Answer»

(a) The species N³⁻, O²⁻, F⁻,Na⁺ in their increasing order of ionic radii:

Na⁺ < F⁻< O²⁻ < N³⁻

(b) Across the period-Atomic radii decrease on account of the following facts: Nuclear charge increases progressively by one unit but the additional electron goes to the same principal shell. As a result, the electron cloud is pulled closer to the nucleus by the increased effective nuclear charge.

Across the group: Atomic radii increase

Reason: Nuclear charge increases with increase in atomic numbers but at the same time, there is progressive increase in principal energy levels.

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