SOME ONE HELP PLEAAASEEE

What is the lowest number energy level where a d sublevel is found

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products

Scuba divers use tanks of compressed air to them breathe. gases can be compressed because?