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(20 points)
Write the shorthand electron configuration for the first 20 elements. Write commas between numbers, but no spaces.
Example: 2,8,3
| Group 1 | Group 2 | Group 13 | Group 14 | Group 15 | Group 16 | Group 17 | Group 18 | |
|---|---|---|---|---|---|---|---|---|
| Period 1 | Hydrogen |
— | — | — | — | — | — | Helium |
| Period 2 | Lithium |
Beryllium |
Boron |
Carbon |
Nitrogen |
Oxygen |
Fluorine |
Neon |
| Period 3 | Sodium |
Magnesium |
Aluminium |
Silicon |
Phosphorus |
Sulfur |
Chlorine |
Argon |
| Period 4 | Potassium |
Calcium |
— | — | — | — | — | — |
