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Some people refer to this as the first or innermost shell.
The second energy level can hold eight electrons, as can the third energy level (although this can hold an extra ten in reserve, but you don't need to learn about that unless you study chemistry at a higher level).
This arrangement is summarized in this table:
Energy level Number of electrons it holds
1st 2
2nd 8
3rd 8
The energy levels fill up with electrons from the lowest energy level (innermost shell) and build up outwards. They only start occupying a new energy level when the previous one has been filled.
name symbol orbital meaning range of values value example
principal quantum number
shell
Chlorine can be found on many different locations all over the world...
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