In chemistry, the chemical nomenclature of ionic and molecular compounds uses a systematic approach of prefixes to indicate the number of each element present in the compound. This chemical naming of ...

Mrs Roberts: What do you think you're made of? Mr Spellman: Big question. Grit, determination, hard-working, handsome, charming, funny. Mrs Roberts: Well, I guess. But you're actually made of atoms.

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.