Q.
The decreasing order of the first ionization energy in kJmol–1 of He, Mg and Na is He > Mg > Na. The increasing order of second ionization energy of these elements will be
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a
Na < Mg < He
b
Mg < Na < He
c
Mg < He < Na
d
Na < He < Mg
answer is C.
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Detailed Solution
IP1 of He>Mg>NaIP2 of Na>He>Mg (or) Mg
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