Question

Mention the first 20 elements of the modern periodic table along with their atomic numbers.

Answer 1

1. Hydrogen

2. Helium

3. Lithium

4. Berilium

5. Boron

6. Carbon

7. Nitrogen

8. Oxygen

9. Fluorine

10. Neon

11. Sodium

12. Magnesium

13. Aluminium

14. Silicon

15. Phosphorous

16. Sulphur

17. Chlorine

18. Argon

19. Potassium

20. Calcium

Answer 2

Hydrogen-H

Helium-He

Lithium-Li

Beryllium-Be

Boron-B

Carbon-C

Nitrogen-N

Oxygen-O

Fluorine-F

Neon-Ne

Sodium-Na

Magnesium-Mg

Aluminium-Al

Silicon-Si

Phosphorus-P

Sulphur-S

Chlorine-Cl

Argon-At

Potassium-K

Calcium-Ca

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