Question

Answer the following question

1. 20 elements ​

Answer 1

Explanation:

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.Aluminum (Al)

14.Silicon (Si)

15.Phosphorus (P)

16.Sulfur (S)

17.Chlorine (cl)

18.Argon (Ar)

19.Potassium (K)

20.Calcium (ca)