Question

explain the trend of electronegativity​

Answer 1

Answer:

across the period : it increases

down the group : it decrease

Answer 2

Electronegativity is defined as the ability of an element to attract the bonding pair of electrons towards itself.

Pauling scale is widely used to measure electronegativity.

According to pauling scale , Fluorine has the highest electronegativity in the periodic table and it's value is 0.4 , whereas Caesium and Francium are the least electronegative elements with value 0.7

Atoms with low ionization energies have low electronegativity (nucleus do not have strong attraction for electrons)

Atoms with high ionization energies have high electronegativity (nucleus has strong attraction for electrons)

TRENDS IN ELECTRONEGATIVITY ACROSS A PERIOD :

• When we move from left to right in a period of modern periodic table , electronegativity increases .

• This is because as you go from left to right , the nuclear charge is increasing faster than the electron shielding so the attraction that the atoms have for the valence electrons increases.

TRENDS IN ELECTRONEGATIVITY IN GROUPS :

• When we go down in a periodic table , electronegativity decreases.

• This is because as you go from top to bottom , the atoms of each element has increasing number of energy levels. Thus electrons in a bond are farther away from the nucleus and are held less tightly.