Question

What are the 1st 20 elements of the periodic table ?

Answer 1

In order of increasing atomic number, the first 20 elements and their symbols are:

Hydrogen (H)

Helium (He)

Lithium (Li)

Beryllium (Be)

Boron (B)

Carbon (C)

Nitrogen (N)

Oxygen (O)

Fluorine (F)

Neon (Ne)

Sodium (Na)

Magnesium (Mg)

Aluminum (Al)

Silicon (Si)

Phosphorus (P)

Sulfur (S)

Chlorine (Cl)

Argon (Ar)

Potassium (K)

Calcium (Ca)

Answer 2

Answer:

1. hydrogen       11.Sodium

2.Helium           12.Magnesium

3.Lithiyum         13.Aluminium

4.Berilium         14.silicon

5.Boron             15.phosphorous

6.Carbon           16.sulpher

7.Nitrogen          17.chlorine

8.Oxygen           18. Argon

9. Flurine            19. Pottasium

10. Neon              20. Calcium

Explanation: