Question

Q) Which of the following has no units?
a) electronegativity
b) electron gain enthalpy
c) ionisation enthalpy
d) excitation potential​

Answer 1

Explanation:

electronegativity

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Answer 2

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A) Electronegativity √√

$\huge\mathfrak\red{Explanation:-}$

Electronegativity is that an element's electronegativity is the power of an atom when in a molecule to attract electron density to itself. The electronegativity depends upon a number of factors and in particuler as the other atoms in the molecule.

There are no units of electronegativity. Linus Pauling designed a scale of electro negativity that ranks elements with respect to each other. So, for example, fluorine is a 4.0 in comparison to 0.7 for francium. These are the most and least electronegative elements respectively.