Periodic TableMedium
Question
Arrange the following elements in increasing order of first ionization enthalpy:
Li, Be, B, C, N
Choose the correct answer from the options given below:
Options
A.$Li < Be < C < B < N$
B.$Li < Be < N < B < C$
C.$Li < Be < B < C < N$
D.$Li < B < Be < C < N$
Solution
Sol. [Key Concept: First ionisation enthalpy]
The increasing order is Li < B < Be < C < N, option (4). Boron loses a 2p electron more readily than beryllium loses a 2s electron; Be has the relatively stable 2s² subshell. The supplied numerical values, approximately 520, 801, 899, 1086 and 1402 kJ mol⁻¹ in this order, support the ranking.
| Element | First ionization enthalpy ( $\Delta_{i}H/kJ{mol}^{- 1}$ ) |
|---|---|
| Li | 520 |
| Be | 899 |
| B | 801 |
| C | 1086 |
| N | 1402 |
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