Describe the difference between an atom and a compound. Include three differences. HELP ME PLSS!!

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

Why is it possible for different microorganisms to extract energy not only from carbohydrates and other biological molecules but from a large variety of substances?

Element j is 1s 2s 2p 3s . (i) how many unpaired electrons does j have? (ii) is j a good oxidizing agent or a reducing agent? (iii) state reason for the answer.