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Fourth Question (:

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

Isotopes are different atoms of the same element which have the same number of protons but different number of neutrons.

Isotopes	Mass Number	neutrons	Atomic Number	protons	electrons	Electronic structure	Valence electrons
chlorine 35	35	18	17	17	17	2.8.7	7
chlorine 37	37	20	17	17	17	2.8.7	7

They have the same number of protons that is 17 but they do not have the same number of neutrons as chlorine 35 has 18 neutrons and chlorine 37 has 20 neutrons. As they both have the same number of protons but different number of neutrons, we can hence conclude that they are isotopes.

taken from http://alexteoh.com/Atomic%20Structure.htm