What was the measurable value Avogadro used to build his scale, and how would you describe the similarity between that concept and the modern-day concept of electronegativity?

oxygenicity values

Explanation:

The measurable value upon which Avogadro established his scale is called oxygenicity values.

It is similar to the concept of modern-day  electronegativity in that when two electrified bodies are in contact, the electrical potential between the bodies in contact is a measurable value.

This idea bears a striking similarity to our modern-day concept of electronegativity which is defined as a measure of the ability of an atom in a bond to attract electrons towards itself.

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