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periodic table
| Term | Definition |
|---|---|
| Hydrogen/ H | 1 |
| Helium/ He | 2 |
| Lithium/ Li | 3 |
| Beryllium/ Be | 4 |
| Boron/ B | 5 |
| Carbon/ C | 6 |
| Nitrogen/ N | 7 |
| Oxygen/ O | 8 |
| Fluorine/ F | 9 |
| Neon/ Ne | 10 |
| Sodium/ Na | 11 |
| Magnesium/ Mg | 12 |
| Aluminum/ Al | 13 |
| Silicon/ Si | 14 |
| Phosphorus/ P | 15 |
| Sulfur/ S | 16 |
| Chlorine/ Cl | 17 |
| Argon/ Ar | 18 |
| Bromine/ Br | 35 |
| Iodine/ I | 53 |
| Mercury/ Hg | 80 |
| Calcium/ Ca | 20 |
| Potassium/K | 19 |