Question

On Mulliken scale, the average of ionization energy and electron affinity is known as electronegativity. If true enter 1 or else 0.

Answer 1

Hint: There are different scales to measure electronegativity as it is a relative quantity not an absolute term. Mullikan considered the concept of removal and addition of electrons to calculate the electronegativity.

Complete step by step answer:
Electronegativity is the relative tendency of a bonded atom to attract a shared electron pair toward itself. Electronegativity is unit less and does not depend upon electronic configuration. On moving down the group with increasing atomic size, electronegativity decreases. Along the period with increasing effective nuclear charge, electronegativity increases. Higher oxidation state elements have higher electronegativity than lower oxidation state of the same element. Electronegativity is directly proportional to percentage ‘s’ character. Electronegativity of an element is not constant value and electronegativity of inert gas is considered zero due to stable configuration. Higher electronegativity corresponds to higher non metallic character. Some important Electronegativity values are fluorine (electronegativity is 4), oxygen (EN is $3.5$), nitrogen (EN is 3), chlorine (EN is 3), sulphur (EN is $2.5$), phosphorus (EN is $2.1$), Bromine (EN is $2.8$), iodine (EN is $2.5$).
Different types of scales to find electronegativity:
Pauling scale, it is based upon resonance energy or bond energy.
\[{\text{EN}}\left( {\text{X}} \right){\text{ }} - {\text{ EN}}\left( {\text{Y}} \right){\text{ }} = {\text{ }}0.102{\text{ }}\left( {{\Delta ^{1/2}}} \right)\]
Mulliken scale: the electronegativity of the element is the average sum of its ionization energy and electron affinity.
\[{\text{EN}} = \dfrac{{\left( {{\text{IP}} + {\text{EA}}} \right)}}{2}{\text{ eV}}/{\text{atom}}\]
Alfred roscho scale: electronegativity is electrostatic attraction force between nucleus and valence shell electrons.

Thus, the correct answer is 1.
Note:
 Electropositivity is just opposite to electronegativity. An element with higher electronegativity is less electropositive and vice versa. Higher electropositive corresponds to higher metallic character. On moving down the group with increasing metallic character, electropositive character increases. On moving along the period, with increasing electronegativity or increasing non metallic character, the electropositive effect decreases.