What change occurs every time elements form a compound?
a. the state of matter in the compound will change.
b. ratio of the elements in the compound will vary.
c. original properties of the elements will change.
d. elements in the compound will always dissolve.

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

d.) circle motion requires a force to give it a centripetal acceleration.