Question

atomic number table 1 to 20
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Answer 1

Answer:

Explanation: AN: atomic no.

AN Element Symbol

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 Sulfur         S

17 Chlorine   Cl

18 Argon       Ar

19 Potassium K

20 Calcium           Ca