How to work out the electron configurations:
- Find the element in the periodic table and circle the proton number
- eg. Nitrogen has a proton number of 7
- 2. Whatever the number of protons is,the number of electrons is the same
- eg. Nitrogen has 7 protons so it must have 7 electrons
- 3. Follow the electron shell rules. The first shell can only take 2 electrons and the second shell can take a maximum of 8 electrons
- So the electron configuration for nitrogen must be 2 , 5 ( 2 + 5 = 8 )
Example (Argon)
- Proton number of 18
- 2 in the first shell, 8 in the second shell and then there has to be 8 in the 3rd as well
- 2 , 8, 8 (2+8+8=18)
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