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ChemistryNEET 2024Periodic trends: radius, ionisation enthalpy, electron gain enthalpy, electronegativity

Classification of Elements and Periodicity in Properties

Arrange the following elements in increasing order of first ionisation enthalpy: Li, Be, B, C, N.

Choose the correct answer from the options given below:

  1. A.Li < B < Be < C < N✓
  2. B.Li < Be < C < B < N
  3. C.Li < Be < N < B < C
  4. D.Li < Be < B < C < N

Solution

Ionisation enthalpy generally rises across the period, but Be (, filled subshell) is higher than B (whose electron is easier to remove). Order: Li < B < Be < C < N.

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