What is electronegativity ? Explain periodicity in periodic table.

1.	What is electronegativity ? Explain periodicity in periodic table.
Answer» Solution :Electronegativity: "CAPACITY to attract electron of element in chemical compound is known as electronegativity." It is not a measurable QUANTITY. Linus Pauling, an American scientist in 1922 assigned arbitrarily a value of `4.0` to fluorine. Periodicity : When we GO left to RIGHT in periodic table electronegativity increases. Ex. Second Period When we go top to bottom in periodic table electronegativity decreases. Electronegativity of noble gas is almost zero. Electronegativity Values (on Pauling scale) Across the Periods Explanation : In period attraction of nucleus and electron increases so atomic radius decreases so electronegativity increases. When we go to top to bottom in group, atomic radius increases with electronegativity decreases. So tendency of electronegativity is same as Ionisation enthalpy OPPOSITE as atomic radius.

Discussion