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.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

tracks, burrows, eggshells, nests, tooth marks, or gastroliths