write the electionic configuration of first 20 elements
in the periodic table
Answers
15. Phosphorous (2,8,5)
16. Sulfur (2,8,6)
17. Chlorine (2,8,7)
18. Argon (2,8,8)
19. Potassium (2,8,8,1)
20. Calcium (2,8,8,2)
Name Atomic Number Electron Configratn.
Hydrogen 1 1s1
Helium 2 1s2
Lithium 3 1s2 2s1
Beryllium 4 1s2 2s2
Boron 5 1s2 2s2 2p1
Carbon 6 1s2 2s2 2p2
Nitrogen 7 1s2 2s2 2p3
Oxygen 8 1s2 2s2 2p4
Fluorine 9 1s2 2s2 2p5
Neon 10 1s2 2s2 2p6
Sodium 11 1s2 2s2 2p6 3s1
Magnesium 12 1s2 2s2 2p6 3s2
Aluminum 13 1s2 2s2 2p6 3s2 3p1
Silicon 14 1s2 2s2 2p6 3s2 3p2
Phosphorus 15 1s2 2s2 2p6 3s2 3p3
Sulfur 16 1s2 2s2 2p6 3s2 3p4
Chlorine 17 1s2 2s2 2p6 3s2 3p5
Argon 18 1s2 2s2 2p6 3s2 3p6
Potassium 19 1s2 2s2 2p6 3s2 3p6 4s1
Calcium 20 1s2 2s2 2p6 3s2 3p6 4s2
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