When a substance changes from one phase to another, which of the following occurs? A.
The substance loses or gains heat.

B.
The average kinetic energy of the substance changes.

C.
The temperature of the substance changes.

D.
The molecular motion of the substance changes.

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.

How are isotopes of the same chemical element alike? how are they different?

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive