write the electronic confregation of 1 to 20 elements
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1) Hydrogen- 1
2) Helium- 2
3) Lithium- 2,1
4)Berrylium-2,2
5)Boron-2,3
6) Carbon-2,4
7) Nitrogen-2,5
8) Oxygen-2,6
9) Flourine-2,7
10) Neon-2,8
11) Sodium-2,8,1
12) Magnesium-2,8,2
13) Aluminum-2,8,3
14) Silicon-2,8,4
15) Phosphorus-2,8,5
16) Sulphur-2,8,6
17) Chlorine-2,8,7
18) Argon-2,8,8
19)Pottasium-2,8,8,1
20) Calcium-2,8,8,2
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refer the above pic
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