3 points The Periodic Law states that there is a periodic repetition of physical and
chemical properties of elements
O when they are arranged in order of increasing atomic radii
when they are arranged in order of increasing atomic number
if only metals are considered
O when they are arranged in order of increasing atomic mass

c8h10 is your answerr

elements make up everything, and they combine to make compounds.

the answer is c

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)