Question

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Generally, the first ionization energy increases along a period. But there are some exceptions. One which is not an exception is

(a) N and O
(b) Na and Mg
(c) Mg and Al
(d) Be and B

✨✨NOTE - EXPLAIN THE ANSWER MORE THAN THE 100 WORDS.✨✨

Answer 1

HEY MISS !!!

HERE'S THE ANSWER..

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♠️ As in case of humans , we are always looking for a comfortable job , same with elements they want a stable position that's why they make bonds ( lossing or by gaining electron )

♠️ Ionisation enthalpy is energy required to remove one electron from valance shell.

♠️ Generally, the first ionization energy increases along a period. But there are some exceptions. One which is not an exception is { Mg and Al } and { Be and B } ,

▶️ This is because of the following reason

⏺️ As we know

=> Be ( Z = 4 )

=> E.C. of Be
$1 {s}^{2} \: 2 {s}^{2}$

=> B ( Z = 5 )

=> E.C of B

$1 {s}^{2} \: 2 {s}^{2} \: 2 {p}^{1}$

♠️ ( 1 ) From their Electronic configuration we can conclude that Be has his last shell full , so it will take move energy to remove one electron , And we can see there is only one electron in last shell of p - orbital in B , So it will easily lose that electron ( less energy required ) to attain stable position .

♠️( 2 ) More orbitals means more distance between nucleus and atom which lead to less attractive force , that's why B , losses electron easily

▶️ Now same case for Mg and Al

=> Mg ( Z = 12 )

=> E.C of Mg

$1 {s}^{2} \: 2 {s}^{2} \: 2 {p}^{6} \: 3 {s}^{2}$

=> Al ( Z = 13 )

=> E.C of Al

$1 {s}^{2} \: 2 {s}^{2} \: 2 {p}^{6} \: 3 {s}^{2} \: 3 {p}^{1}$

♠️ ( 1 ) From their Electronic configuration we can conclude that Mg has his last shell full , so it will take move energy to remove one electron , And we can see there is only one electron in last shell of p - orbital in Al , So it will easily lose that electron ( less energy required ) to attain stable position .

♠️( 2 ) More orbitals means more distance between nucleus and atom which lead to less attractive force , that's why Al , losses electron easily .

HOPE HELPED..

JAI HIND..

:-)

Answer 2

here is your answer hope it helps!!!!!!!!