Explain the trend in general of ionisation potential of elements (1)

1.	Explain the trend in general of ionisation potential of elements (1) on moving from left to right across a period (2) on moving down a group. Give reasons for the change in the periodic trend in each case
Answer» (a) Ionisation potential increases across a period left to right. Reason: The nuclear charge increases – The nuclear attraction on the outer electrons increases. Hence the outer electrons are more firmly held. ∴ Ionisation potential increases (b) Ionisation potential decreased down group. Reason: Atomic size increases The nuclear attraction on the outer electrons decreases. Hence the outer electrons are loosely held. ∴ Ionisation potential decreases.

Explain the trend in general of ionisation potential of elements (1) on moving from left to right across a period (2) on moving down a group. Give reasons for the change in the periodic trend in each case

Answer»

(a) Ionisation potential increases across a period left to right.

Reason: The nuclear charge increases – The nuclear attraction on the outer electrons increases. Hence the outer electrons are more firmly held.

∴ Ionisation potential increases

(b) Ionisation potential decreased down group.

Reason: Atomic size increases The nuclear attraction on the outer electrons decreases. Hence the outer electrons are loosely held.

∴ Ionisation potential decreases.

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Explain the trend in general of ionisation potential of elements (1) on moving from left to right across a period (2) on moving down a group. Give reasons for the change in the periodic trend in each case

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