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Here is a list of the first 20 elements with their atomic number, atomic symbol, and atomic mass:
| Element | Atomic Symbol | Atomic Number | Atomic Mass |
|---|---|---|---|
| Hydrogen | (H) | 1 | 1.0079 |
| Helium | (He) | 2 | 4.0026 |
| Lithium | (Li) | 3 | 6.941 |
| Beryllium | (Be) | 4 | 9.0122 |
| Boron | (B) | 5 | 10.81 |
| Carbon | (C) | 6 | 12.0107 |
| Nitrogen | (N) | 7 | 14.01 |
| Oxygen | (O) | 8 | 16.00 |
| Fluorine | (F) | 9 | 19.00 |
| Neon | (Ne) | 10 | 20.18 |
| Sodium | (Na) | 11 | 22.99 |
| Magnesium | (Mg) | 12 | 24.31 |
| Aluminum | (Al) | 13 | 26.98 |
| Silicon | (Si) | 14 | 28.09 |
| Phosphorus | (P) | 15 | 30.97 |
| Sulfur | (S) | 16 | 32.06 |
| Chlorine | (Cl) | 17 | 35.45 |
| Argon | (Ar) | 18 | 39.95 |
| Potassium | (K) | 19 | 39.10 |
| Calcium | (Ca) | 20 | 40.08 |
Periodic Table First 20 Elements
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