# How do you know what elements will bond in a reaction? [closed]

I know all about the types of reactions, synthesis, decomp. etc., but when a bond is broken, how do you know that the free element will bond to another molecule?

Is it because that element has a higher electronegativity? Is it because the product is lower energy?

Why does the free element choose a specific element to bond and how do I know what element it'll bond with?

• There is no pat answer to your very broad questions. As a chemist you either have the knowledge, or you often can often make an educated guess. – MaxW Aug 2 '20 at 6:24
• You know that by applying a few simple rules, which are not really simple and not really few. In fact, there are entire books devoted to this subject. They are typically titled "Chemistry" on the top cover. – Ivan Neretin Aug 2 '20 at 17:59
• Haha wish it was that easy :( .But then if it was then Chemistry would probably not even exist. – Vamsi Krishna Aug 2 '20 at 18:39

To add an analogy: imagine you have a friend who married a jerk, and you wonder why. After all, there are so many people in the world, nearly $$10^{10}$$ at the latest count! How do people decide who to pair up with? Well, in that case it might have been due to a chance encounter at a mixer at which both got slightly tipsy (and believe it or not he happened to be the nicest guy there).