It tells us the number of protons that are present in the nucleus, the positively charged region of that atom.
The element chlorine has 17 electrons, 17 protons and 18 neutrons....<span> In an atom there is an equal number of electrons and protons. The number of neutrons is found by subtracting the atomic number from the mass number ...
Hope it helps !!!</span>
Answer is miles sir your welcome it was simple