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  • Ionisation enthalpies of elements of second period are given below: Ionisation enthalpy/ k cal mol–1 520, 899, 801, 1086, 1402, 1314, 1681, 2080. Match the correct enthalpy with the elements and complete the graph given in Fig. 3.1.

Ionisation enthalpies of elements of the second period are given below: Ionisation enthalpy/ k cal mol–1: 520, 899, 801, 1086, 1402, 1314, 1681, 2080. Match the correct enthalpy with the elements and complete the graph given in Fig. 3.1. Also, write symbols of elements with their atomic number.

Answers (1)

To match the correct enthalpy with the elements and to complete the graph the following points are taken into consideration. As we move from left to right across a period, the ionisation enthalpy keeps on increasing due to increased nuclear charge and simultaneous decreases in atomic radius.
How ever there are some exceptions given below.

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