An element's ____ defines it. An ____ with 17 protons will always be chlorine. However, an element's ____ can vary, which means that it can have ____ numbers of ____. So although chlorine has a mass number of 35 which means it has 18 neutrons, it can also have a mass number of 37, which means it has ____. The different types of chlorine are called ____

Isotopes

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