The decreasing order of the ionisation potential in the following elements is :

N e > C l > P > S > A l > M g

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N e > C l > P > S > M g > A l

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N e > C l > S > P > M g > A l

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N e > C l > S > P > A l > M g

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Solution

The correct option is B $N e > C l > P > S > M g > A l$
Along the period from left to right ionisation potential increases.

1st ionisation potential of group IIA elements is always higher than the 1st ionisation potential of group IIIA elements.

1st ionisation potential of group VA elements is always higher than the 1st ionisation potential of group VIA elements.

So, the sequence is : $N e > C l > P > S > M g > A l$

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Question 17
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