Valency used in a sentence

Valency in a sentence as a noun

" then to "What is the valency of carbon?"?

If you're just aiming to communicate in German, you can ignore noun gender, valency, many tenses, etc.

He's a restaurant reviewer but he draws vocabulary from chemistry, talking about the "dual valency" of a noun.

In chemistry too, I remember being taught about valency and how you could work out the valency of an element by its position on the periodic table.

I asked what valency actually was, either didn't understand or wasn't satisfied with the answer, asked again, and the teacher brushed off my question and carried on the with the lesson.

I don't particularly care which element has how many isotopes and what the valency is and how many other elements it can bond with, though I did memorize the atomic weights of all the elements in the periodic table and Avogardo number and few such stats.