Question

How is electronegativity valued in the halogen family?

Answer 1

Hint: Halogen family means group number 17 of the periodic table and the elements of this group have atomic numbers 9, 17, 35, 53, and 85. The values of electronegativity of halogens are very high and these are measured on the Pauling scale.

Complete answer:
There are many properties of the elements which help us to study the nature of the element. These properties are melting point, boiling point, electron gain enthalpy, electronegativity, solubility, etc.
So, in the question, we have to tell the electronegativity of the halogen family. Halogen family means the group number 17 of the periodic table and the elements of this group have atomic numbers 9, 17, 35, 53, and 85, so the element having the atomic number 9 is fluorine, the element having atomic number 17 is chlorine, the element having atomic number 35 is bromine, the element having atomic number 53 is iodine, and the element having atomic number 85 is astatine.
So, these elements have a very high tendency to attract a shared pair of electrons towards themselves which is known as electronegativity and we know that as we move down the group the electronegativity decreases because of the size of the element increases.
The value of electronegativity of fluorine is 4.0, the electronegativity of chlorine is 3.0, the electronegativity of bromine is 2.8, the electronegativity of iodine is 2.5, and the electronegativity of astatine is 2.2.

Note:
Chlorine has a greater affinity for electrons than Fluorine. While fluorine is the most electronegative element, it has a lower electron affinity than chlorine. Fluorine's small scale is the reason for this.