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For atom 'A' ionisation energy is given ...

For atom 'A' ionisation energy is given in eV.
`{:(I.E._(1),I.E._(2),I.E._(3),I.E._(4),I.E._(5)),(11.2,24.3,37.4,48.4,392.0):}`
How many electrons are present in valance shell of that atom ?

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