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# The correct order of first ionization potential is :

$(a)\;F > He > Mg > N > O \\(b)\;He > E > N > O > Mg \\ (c)\;He > O > f > Mg \\ (d)\;N > F > He> O > Mg$

The correct order of first ionization potential is $He > E > N > O > Mg$
Hence b is the correct answer.