What is electronegativity?

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Electronegativity is the ability of an atom to attract a shared pair of electrons towards itself. For example in HCl, Chlorine is more electronegative than hydrogen so it will attract shared electron pairs towards itself.
Atomic size is the distance between the centre of the nucleus of an atom and its outermost shell.
Valency is defined as combining the power of an element with other atoms to form a chemical bond.
Electron affinity is the amount of energy liberated when an electron is added to a neutral atom to form a negatively charged ion.

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