Question

In an experiment 264g of strontium reacts with 213g of chlorine. What is the formula of strontium chloride?

​

Answer 1

Explanation:

SrCl2. Strontium is in group two. That means it has two valence electrons that it transfers to another element to give itself a +2 charge. Chlorine is a group 17 element. That means that it has 7 valance electrons. It will accept one more to give itself 8 total which means the chloride ion has a charge on -1. Since we want these charges to cancel out, we need two chloride ions (+2-1-1=0). If you look at the Lewis dot diagrams of these elements, this might be more obvious. Things will react to have a full set of valence electrons. You can see examples of this on Youtube. My favorite place to look is Khan Academy.