How many neutrons are in an atom of chlorine?

The atomic mass of the element may be used to calculate the amount of neutrons. In order to determine the number of protons and electrons in an atom, first determine its atomic number. Next, subtract the atomic mass from the number of protons or electrons to determine the number of neutrons.

As we are all aware, an atom primarily consists of three elements: electrons, protons, and neutrons. Electrons are those that have a negative charge and move around the nucleus, protons are those that have a positive charge and stay within the nucleus, and neutrons are those that have no charge and stay inside the nucleus.

The atomic number of chlorine, an element of the p-group block's 17, is 17. This indicates that each chlorine atom contains 17 electrons. Since there will be an equal amount of protons and electrons in an electrically neutral chlorine atom. Therefore, there will also be 17 protons. Now that we know the atomic mass of the chlorine atom and the atomic mass of the chlorine atom 35, we can calculate the number of neutrons in the atom. The number of neutrons may be calculated by subtracting the atomic mass from the total number of protons or electrons in an atom.

So, the number of neutrons will be:
35−17=18
Therefore, there are 18 neutrons in the chlorine atom.

Hence, option B is correct.