Question

what is electronegativity?explain why halogens possess highest electronegativity?

Answer 1

Electronegativity depends upon the attraction between the nucleus and bonding electrons in the outer shell. ... This reactivity is due to high electronegativity and high effective nuclear charge.

Halogens can gain electrons by reacting with other elements

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Answer 2

Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself. An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.

This reactivity is due to high electronegativity and high effective nuclear charge. Halogens can gain an electron by reacting with atoms of other elements. Fluorine is one of the most reactive elements. It reacts with otherwise inert materials such as glass, and it forms compounds with the heavier noble gases.