he atomic weight of chorine is ______________and the atomic number of chlorine-35 is________________. 35, 17 17, 35 35.4527; 17 35.4527; 35 Answer C) the atomic weight is the average of mass of all isotopes of chlorine atoms and found below the symbol on the periodic table. The atomic number is the number of protons in all chlorine atoms and is found on the top of the symbol in the periodic table