ChemistryNEET 2019Periodic trends: radius, ionisation enthalpy, electron gain enthalpy, electronegativity

Classification of Elements and Periodicity in Properties

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

A. $Li < Be < B < C < N < O < F < Ne$
B. $Li < B < Be < C < O < N < F < Ne$ ✓
C. $Li < B < Be < C < N < O < F < Ne$
D. $Li < Be < B < C < O < N < F < Ne$

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

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Last revised 7 Sept 2026. Found a mistake? Tell us — corrections are the fastest thing we act on.

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