What differentiates the isotopes of an element?
a) number of protons
b) number of neutrons
c) number of electrons
d) atomic number

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?