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 MATE ,HERE IS YOUR ANSWER

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For N and O,N has greater ionisation enthalpy because of half filled EC

Na and Mg is the correct answer as Na tend to lose one electron to attain octet EC

Mg has higher ionisation enthalpy because of its filled 3s orbital than Al

Be has higher ionisation enthalpy because of its filled 2s orbital than B


SO THE ANSWER IS (b)