NEET 2019 Chemistry question

For the second period elements the correct increasing order of first ionisation enthalpy is:

(1)Li < Be < B < C < N < O < F < Ne
(2)Li < B < Be < C < O < N < F < NeCorrect
(3)Li < B < Be < C < N < O < F < Ne
(4)Li < Be < B < C < O < N < F < Ne

Answer: (2)

Solution

Across period 2 the first ionisation enthalpy generally increases with increasing nuclear charge, but there are two exceptions. Be (, fully filled) has a higher ionisation enthalpy than B (), since the electron of B

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Question ID VK-092434