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Ionisation energies of unknown elements ...

Ionisation energies of unknown elements are given below :
`|{:("Element",,"IE(in kcal/mol)",),(," I"," II","III"),(" M",209," "548,919),(" N",100," "735,1101),(" O",119," "1092,1653),(" P",1500," "2017,2320):}|`
Which amongst them is expected to be a noble gas?

A

M

B

N

C

O

D

P

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The correct Answer is:
D
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