The more carbon atoms a hydrocarbon has, the greater the number of isomers.  If Jim is comparing hydrocarbons and he finds one that has more carbon atoms, the number of isomers that hydrocarbon contains is greater or smaller?
greater

Because these isotopes decay more slowly, they can be used to date much older specimens.  For dating the age of a fossil, and compared to the isotope Carbon 14 with its 5730 year half-life, would Francium with a 22 minute half-life be a less useful isotope? or more useful isotope?
less useful isotope?

So the higher an object is above a surface, the more potential energy it has.  A ball that is on the top of the empire state building about to be dropped off will have more or less potential energy than a ball on the ground?

more