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Stack #125011
| Element | Atomic Number |
|---|---|
| Hydrogen | 1 |
| Helium | 2 |
| Lithium | 3 |
| Beryllium | 4 |
| Boron | 5 |
| Carbon | 6 |
| Nitrogen | 7 |
| Oxygen | 8 |
| Fluorine | 9 |
| Neon | 10 |
| Sodium | 11 |
| Magnesium | 12 |
| Aluminium | 13 |
| Silicon | 14 |
| Phosphorus | 15 |
| Sulfur | 16 |
| Chlorine | 17 |
| Argon | 18 |
| Potassium | 19 |
| Calcium | 20 |