First slide

Periodic Trends

Question

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

Moderate

A

$Li < Be < B < C < O < N < F < Ne$
B

$Li < Be < B < C < N < O < F < Ne$
C

$Li < B < Be < C < O < N < F < Ne$
D

$Li < B < Be < C < N < O < F < Ne$

Solution

As we move across a period, ionisation enthalpy increases, because of increased nuclear charge and decrease in atomic radii. However, abnormal values are observed for Be, N and Ne due to extra stability of half filled and fully filled orbitals. Thus, the actual order is, $Li < B < Be < C < O < N < F < Ne$

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