The number of isotopes of hydrogen.

Hydrogen has 1 proton p, 1 electron e and 0 neutrons n in a neutral atom. This atom is called protium.

Isotopes of hydrogen can be obtained by increasing the number of neutrons per atom.

As a result, the formula of their atom will be as follows:

1) Protium – 1p 0n

2) Deuterium – 1p 1n

3) Tritium – 1p 2n

4) Quadium – 1p 3n

5) Pentius – 1p 4n

6) Hexium – 1p 5n

7) Septius – 1p 6n.

This means that the number of hydrogen isotopes, not counting the hydrogen atom itself – protium, is 6.

Answer: 6 isotopes of hydrogen.