First 20 elements: protons, electrons and neutrons

Hydrogen, H

1 proton, 1 electron, 0 neutrons

Neon, Ne

10 protons, 10 electrons, 10 neutrons

Sodium, Na

11 protons, 11 electrons, 12 neutrons

Magnesium, Mg

12 protons, 12 electrons, 12 neutrons

Aluminium, Al

13 protons, 13 electrons, 14 neutrons

Silicon, Si

14 protons, 14 electrons, 14 neutrons

Phosphorus, P

15 protons, 15 electrons, 16 neutrons

Sulfur, S

16 protons, 16 electrons, 16 neutrons

Chlorine, Cl

17 protons, 17 electrons, 18 neutrons

Argon, Ar

18 protons, 18 electrons, 22 neutrons

Potassium, K

19 protons, 19 electrons, 20 neutrons

Helium, He

2 protons, 2 electrons, 2 neutrons

Calcium, Ca

20 protons, 20 electrons, 20 neutrons

Lithium, Li

3 protons, 3 electrons, 4 neutrons

Beryllium, Be

4 protons, 4 electrons, 5 neutrons

Boron, B

5 protons, 5 electrons, 6 neutrons

Carbon, C

6 protons, 6 electrons, 6 neutrons

Nitrogen, N

7 protons, 7 electrons, 7 neutrons

Oxygen, O

8 protons, 8 electrons, 8 neutrons

Fluorine, F

9 protons, 9 electrons, 10 neutrons