what is the difference between two atoms of carbon having the same number of neutrons?

a.
nothing

b.
the number of protons

c.
the number of electrons

d.
there may be differences in how they react with oxygen

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.