Which electron configuration represents the electrons of an atom in an excited state? 1.
2-5
2.
2-8-5
3
2-5-1
4
2-6

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

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

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?