Question

what is the periodic trend in the variation of valency while going down a group? explain your answer with reference to group 1 , group 2and group 18?​

Answer 1

Answer:-

Periodic Table:-

》 Group 2 elements have the valency 2 and group 18 elements have their valency 0 due to their inertness.

》 Valence numbers do not vary as you go down a group, since the periodic table is arranged by atomic number and chemical properties.

》All members of a group have the same number of valence electrons.

》 The atomic radius usually increases while going down a group due to the addition of a new energy level (shell).

》However, atomic radii tend to increase diagonally, since the number of electrons has a larger effect than the sizeable nucleus.

》There is no universal pattern, the changes are different in different columns.

Explanation:-

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