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Argon has a total of 18 electrons. There are 2, 8 and 8 electrons in the 1st, 2nd and 3rd energy levels respectively.
Once one shell is full, the next electron that is added has to move to the next shell. So... for the element of ARGON, you already know that the atomic number tells you the number of electrons. That means there are 18 electrons in an argon atom. Looking at the picture, you can see there are two electrons in shell one, eight in shell two, and eight in shell three.