The first ionisation energies of magnesium and aluminium are respectively given by

Question

The first ionisation energies of magnesium and aluminium are respectively given by (A) 7.64, 5.98 (B) 7.64, 7.64 (C) 5.98, 7.64 (D) 5.98, 5.98

Tardigrade Admin · Accepted Answer

IE of Mg>IE of Al Electronic configuration of textMg=1 texts2,2 texts2,2 textp2,3 texts2 textAl=1 texts2,2 texts2,2 textp6,3 texts2,3 textp1 Mg has stable configuration (fulfilled) than Al so removal of an electron is difficult hence, required more energy i.e. more ionisation energy.

Q. The first ionisation energies of magnesium and aluminium are respectively given by

7.64, 5.98

7.64, 7.64

5.98, 7.64

5.98, 5.98

$I E$ of $M g > I E$ of $A l$
Electronic configuration of
$Mg = 1 s^{2}, 2 s^{2}, 2 p^{2}, 3 s^{2}$
$Al = 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1}$
$M g$ has stable configuration (fulfilled) than $A l$ so removal of an electron is difficult hence, required more energy i.e. more ionisation energy.

Q. The first ionisation energies of magnesium and aluminium are respectively given by

7.64, 5.98

7.64, 7.64

5.98, 7.64

5.98, 5.98

IE of Mg>IE of Al Electronic configuration of Mg=1s2,2s2,2p2,3s2 Al=1s2,2s2,2p6,3s2,3p1 Mg has stable configuration (fulfilled) than Al so removal of an electron is difficult hence, required more energy i.e. more ionisation energy.