Question
What is the basic theme of organisation in the periodic table?

Answer

The basic theme of organization of elements in the periodic table is to simplify and systematize the study of the properties of all the elements and millions of their compounds. This has made the study simple because the properties of elements are now studied in form of groups rather than individually.

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The first $(\Delta_{1}\text{H}_{1})$ and the second $(\Delta_{1}\text{H}_{1})$ionization enthalpies (in kJ mol–1) and the $(\Delta_{1}\text{H}_{1})$ electron gain enthalpy (in kJ mol–1) of a few elements are given below:
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I 520 7300 -60
II 419 3051 -48
III 1681 3374 -328
IV 1008 1846 -295
V 2372 5251 +48
VI 738 1451 -40
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