The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is

Question

The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is (A) F< S< P< B (B) P< S< B< F (C) B< P< S< F (D) B< S< P< F

Tardigrade Admin · Accepted Answer

In general as we move from left to right in a period, the ionisation enthalpy increases with increasing atomic number. The ionisation enthalpy decreases as we move down a group. P

(1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3})

has a stable half filled electronic configuration hence, its ionisation enthalpy is higher than that of S.

∴

Increasing order of ionization energy is

B < S < P < F .

Q. The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is

$F < S < P < B$

$P < S < B < F$

$B < P < S < F$

$B < S < P < F$

Q. The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is

F<S<P<B

P<S<B<F

B<P<S<F

B<S<P<F

$F < S < P < B$

$P < S < B < F$

$B < P < S < F$

$B < S < P < F$