Q.

The second ionization energy is maximum for

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a

boron

b

beryllium

c

magnesium

d

aluminium

answer is A.

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Detailed Solution

Be1s22s2⟶IE1Be+1s22s1BIE2CM1s22s22p1⟶IE1B+1s22s2⟶IE2Mg1s22s22p63s2⟶IE1Al+1s22s22p63s1⟶IE2Al1s22s22p63s23p1⟶IE1Al+1s22s22p63s2⟶IE2Second I.E. is maximum for B as after removing an electron, B has fullfilled s-subshell.
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The second ionization energy is maximum for