Atom goes from a higher energy state to a lower energy state, the atom

Which substances have the lowest melting points: ionic covalent, or metallic

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

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