What is the probability that four 13c isotopes will be adjacent to each other in benzene? g?

Benzene is an aromatic hydrocarbon with 6 carbon atoms in its structure. Carbon has three naturally occurring isotopes; carbon 12, 13 and 14. Carbon 12 is the most abundant by percentage. Ninety-nine percent of all carbon is carbon twelve. Therefore the probability that 4 carbon 13 atoms will be adjacent to each other is less than 1%.

The answer is probably c. xylem

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom.