It depends on which isotope of chlorine you're interested in.
There are two main isotopes of chlorine. Every chlorine atom has 17 electrons where there are 18 and 20 neutrons in chlorine-35 and chlorine-37 respectively.
A chloride ion (of the isotope 35Cl) with a charge of -1. The 17 protons tell you its chlorine and since there is one more electron than proton it has a charge.
Any atom (or ion) contain protons, neutrons and electrons.
The number of neutrons is different for each isotope. Chlorine-35 has eighteen neutrons. Chlorine-36 has nineteen neutrons. Chlorine-37 has twenty neutrons. ....... etc.
the average amount of neutrons in chlorine is 18, but there could be more or less with the different isotopes
An atom with 17 protons and 20 neutrons would be chlorine-37, which has a total atomic mass of 37 (17 protons + 20 neutrons).
Neutrons do not have a charge, as they are electrically neutral particles. Chlorine typically has a charge of -1 when it gains an electron to form a chloride ion.
Chlorine has 18 neutrons.
Li-6 has 3 neutrons and Li-7 has 4 neutrons.
An Mg2+ ion is a magnesium ion that has a charge of +2, meaning it has lost 2 electrons. The number of neutrons in an Mg2+ ion is the same as in a regular magnesium atom, which is 12 neutrons.
Chlorine has: 17 Protons 17 Electrons (in a neutral atom i.e. not an ion) (Isotope Mass Number - 17) is the number of Neutrons.
The number of neutrons in chlorine is 18 (no of neutrons=atomic mass-no of protons=35-17=18)