Question

Explain how the properties valency and atomic radius changes into and periods ??

Answer 1

Electronegativity. ... Moving down in a group, the electronegativity decreases due to the longer distance between the nucleus and the valence electron shell, thereby decreasing the attraction, making the atom have less of an attraction for electrons or protons.

Answer 2

Atomic radius decreases when we go from left to right because positive charge increases In neutron and electron are pulled closer so atmoic radius decreases

valency first increases and then decreases as we go left to right in group.

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