4. Chlorine-35 atom and Chlorine-37 atom are called isotopes...Use these two examples to explain what is 'isotopes'.

What is "isotopes"?

Isotopes is different atoms of the same element which have the same number of protons but different number of neutrons. An example is chlorine-35 and chlorine-37. Chlorine-35 have 17 protons and 18 neutrons, while chlorine-37 have 17 protons and 20 neutrons. Both chlorine-35 and chlorine-37 have the same number of protons (17) while different number of neutrons. Chlorine-35 has 18 neutrons while chlorine-38 has 20 neutrons. Thus they are isotopes.