Why does one carbon atom combine with FOUR hydrogen atoms not two, not six? Why does oxygen always form exactly two bonds? Every element has a fixed combining power and chemists call it valency. Knowing an element's valency means you can predict the formula of any compound it forms before you even run an experiment. Today you'll learn Valency: what it is, how it's determined, and how to use it to predict chemical formulas. This is the maths of chemistry and it's simpler than it looks!
16/05/2026, 12:13:28
