Each electron in an atom is in an ENERGY LEVEL or SHELL. The inner shell is always filled with electrons first.Each shell can only hold a specific amount of electrons. For GCSE, you only need to know the first 4 shells:
- Shell 1 : 2.
- Shell 2: 8.
- Shell 3: 8.
- Shell 4: 18.
This can be writen out as 2,8,8,18.
EXAMPLE: A sodium atom has 11 Electrons. What is it's electronic structure?
* Elements in the same group will always have the same ammount of Electrons in the outer shell. For example, all elements in group 8 would have 8 electrons in their outer shell... SIMPLE :).
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