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How many electrons, protons and neutrons does chlorine have? A: The chemical element chlorine has 17 electrons, 17 protons and 18 neutrons. An atom, which is the fundamental unit of an element, contains an equal number ... Full Answer >
Another way of looking at what shells to fill is the following chart where the lines show the order of filling for the shells. Lets do a dot diagram for the element Chlorine. Chlorine has 17 electrons. So based on the diagram above we fill the 1s with 2 electrons. Then 2s with 2 electrons and 2p with 6 electrons. So that is 10 electrons so far. The next shell we fill is 3s with 2 electrons. We start filling 3p, but we can only put 5 electrons in that shell. The dot diagram will look like the following.