[عاطف خليفة]

* 4- Electro-negativity

-

The average of the ionization energy and electron affinity.

The Electronegativity is

the tendency of an atom to attract the electrons of the chemical bond to itself”

Electron affinity refers to the single atom while electronegativity refers to the combined atom in molecule

a) In periods

- It increases with the increase of atomic number.

b) In groups

It decreases with the increase of atomic number.

The difference in the electronegativity determines the nature of
bond between two atoms.
Fluorine is the most electronegative elements