Which properties cause chemical reactions?

What does x represent in the formula for the compound xcl4?

What will most likely happen when two bromine atoms bond together?

Some familiar products contain some of the same types of atoms. for instance, the chemical formula for baking soda is nahco 3. the chemical formula for liquid bleach is naclo, and the chemical formula for table salt is nacl. which choice best describes why these three products have some of the same types of atoms in common?