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Electrons are organized into orbitals of varying levels of electrons. Imagine it as a shell, starting with two orbiting 1s2 electrons. From there, you get 2 more. 2s2. It's the second layer of S. Then you go to 2p6. The p electrons are different in that they're more tightly packed. Then you have 3s2. It's the third layer of s electrons. So, the number designates the level of orbital of that subset of electrons.

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