What is the name for the layer of electrically charged particles that allows radio waves to travel across the country and which atmosphere layer is it found in?

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

Nonpoint source pollution is difficult to control because it

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride