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why does electronegativity decreases down the group

Posted by Abhinav Sachdev 7 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 7 years, 8 months ago

As one goes down a group in the periodic table, the atomic radius increases. This is due to an increase in the number of principal energy levels or shells and the increase in shielding (and thus decreased effective nuclear charge) as the atomic number increases. Electronegativity, which is a relative measure of the force of attraction between an atom and the electrons it is sharing in a bond with another atom,decreases as one goes down a group because as the atomic radius increases, there is less attraction between the nucleus and shared electrons (Coulomb's Law). The Period number determines the number of shells or energy levels in an atom.

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