What makes an element different from another?

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

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.

Silver reacts with oxygen to produce silver oxide. (write balanced chemical equation and identify type of chemical reaction.)