Question

How elements of modern period table shows the periodicity of properties?

Answer 1

Answer:

(i) Elements in a group have same number of valence electrons and same valency. ... (ii) Elements present in a group show similar chemical properties. (iii) The atomic sizes of the elements in a group increase regularly.

Answer 2

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Periodicity i.e., repetition of similar properties is shown by the elements present in a group and separated by definite gaps of atomic number. For example, (i) Elements in a group have same number of valence electrons and same valency. (ii) Elements present in a group show similar chemical properties. (iii) The atomic sizes of the elements in a group increase regularly. (iii) The m.p. and b.p. of the elements in a group increase regularly.