MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryPeriodic PropertiesPrevious Year Questions
For the second period elements the correct increasing order of first ionization enthalpy is (NEET 2019)
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✓ Correct
D.Li < B < Be < C < N < O < F < Ne
Explanation
As we move across a period, ionisation enthalpy increases, because of increased nuclear charge and decreases in atomic radii. However, abnormal values are observed for Be, N and Ne due to extra stability of PERIODIC PROPERTIES 59 half filled and fully filled orbitals. Thus, the actual order is Li < B < Be < C < O < N < F < Ne
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