Chlorine, Cl , is located in period 3, group 17 of the periodic table, and has an atomic number equal to 17 . This tells you that a neutral chlorine atom will have a total of 17 electrons surrounding its nucleus. Now, notice that the first energy level doesn't not contain a p-subshell,
Use the formula E=mc^2 energy given=<span>8.1 x 10^16 joules </span>speed of <span>light = 3.00 × 10^8 m/s </span> plug in the values we'll get mass=<span>9.0 x 10-1 kg</span>
