7. which principal energy level change by the
electron of a hydrogen atom will cause the
greatest amount of energy to be absorbed?
(1) n=2 to n= 4
(3) n= 4 to n= 2
(2) n=2 to n=5
(4) n=5 to n=2

Which is mostly likely why many scientists reject the cold fusion theory

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

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.