Question

Why does electronegativity value increases across a period and decreases down the group?
Explain in Detail?​

Answer 1

Explanation:

So, as you move down a group on the periodic table, the electronegativity of an element decreases because the increased number of energy levels puts the outer electrons very far away from the pull of the nucleus. Electronegativity increases as you move from left to right across a period on the periodic table.

Answer 2

Answer:

because size of atom decrease from left to right and increase down the group .

( size increases so nuclear charge decreases

while across the period size of atom decrease is nuclear charge increases)