Question

Write the name, symbol ,and atomic number of the first 20 elements of the periodic table ​

Answer 1

Answer:

first 20 elements are Hydrogen Helium Lithium beryllium Boron carbon Nitrogen Oxygen fluorine neon sodium magnesium aluminium Silicon Phosphorus Sulphur chlorine argon potassium and Calcium

and atomic no. is 1,2,3,4,5,6,7....... respectively

Answer 2

Answer:

1. Hydrogen H

2. Helium He

3. Lithium Li

4. Beryllium Be

5. Boron B

6. Carbon C

7. Nitrogen N

8. Oxygen O

9. Fluorine F

10. Neon Ne

11. Sodium Na

12.Magnesium Mg

13. Aluminium Al

14. Silicon Si

15. Phosphorus P

16. Sulphur S

17. Chlorine Cl

18. Argon Ar

19. Potassium K

20. Calcium Ca