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प्रश्न
Write the names and symbols of the first twenty elements that you have studied in class VI & VII.
उत्तर
| Name of the elements | Symbol | Valency |
| 1. Hydrogen | H | 1 |
| 2. Helium | He | 0 |
| 3. Lithium | Li | 1 |
| 4. Beryllium | Be | 2 |
| 5. Boron | B | 3 |
| 6. Carbon | C | 4 |
| 7. Nitrogen | N | 3 |
| 8. Oxygen | O | 2 |
| 9. Fluorine | F | 1 |
| 10. Neon | Ne | 0 |
| 11. Sodium | Na | 1 |
| 12.Magnesium | Mg | 2 |
| 13. Aluminium | AI | 3 |
| 14. Silicon | Si | 4 |
| 15.Phosphorus | P | 3 |
| 16. Sulphur | S | 2 |
| 17.Chlorine | CI | 1 |
| 18.Argon | Ar | 0 |
| 19. Potassium | K | 1 |
| 20. Calcium | Ca | 2 |
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