Question

19. Electronegativity is given by
a) Average of first and second ionisation energies
b) Average of first and second electron affinities
c) Average of ionisation energy and electron affinity
d) None of these.​

Answer 1

Answer:

Electronegativity is the average of ionization energy and electron affinity.

Explanation:

Electronegativity is the average of ionization energy and electron affinity.

The elements with larger Ionization energies had small or negative Electron affinity and gained electrons (attracts) while elements with small ionization energy had large Electron affinity and lost electrons (does not attract)

This led to the equation that electronegativity is average of ionization energy(I) and Electron affinity(E).

$E = \frac{I +E}{2}$

Answer 2

Answer:

the electron negativity is given by the average of ionisation energy and electron affinity.

Explanation:

It's a dimensionless property because it's just a trend. This essentially shows the net result of the atomic tendencies of the various elements that attract the pair of electrons that form the bond. Measure electronegativity on several scales.

Electronegativity is the relative tendency of bonded atoms to attract a shared pair of electrons. Electronegativity has no units and does not depend on electron configuration. Moving down the group as the atom size increases reduce electronegativity. Electronegativity increases with increasing effective nuclear charge. Higher oxidized components have higher electronegativity than lower oxidized components. Electronegativity is directly proportional to the percentage "s" character. The electronegativity of an element is not constant and the electronegativity of inert gas is considered zero due to its stable composition. Higher electronegativity corresponds to higher non-metallic properties. Some important electronegativity values ​​are fluorine (electronegativity  4), oxygen (EN  3.5), nitrogen (EN  3), chlorine (EN  3), sulfur (EN  2.5), and phosphorus. (EN is 2.1), bromine. (EN is 2.8), iodine (EN is 2.5).  Different types of scales for determining electronegativity:

The polling scale, its based on resonance energy or binding energy.

EN (X) − EN (Y) = 0.102 (Δ^1 / 2)

Mulliken scale: The electronegativity of an element is the average sum of its ionization energy and electron affinity.

EN = (IP + EA) /2  eV / atom

Alfred Roscho Scale: Electronegativity is the electrostatic attraction  between core and valence

hence we can say that the electronegativity is given by the  average of ionisation energy and electron affinity