Question

Why is a hydrogen atom the only atom to have an identical proton number and nucleon number​

Answer 1

Answer:

The nucleon number is the sum of the proton number and the number of neutrons. An isotope's proton number and nucleon number can only be equal when there are no neutrons. Protium has only one proton and no neutron. Thus its proton number and nucleon number are both one.

However, we have other, less common isotopes of hydrogen, including deuterium (H-2), tritium (H-3) and crazy synthetic isotopes like H-7. The nucleon number and proton number of these isotopes are not the same.

Answer 2

Concept:

Nucleon number is defined as the total number of proton and neutrons in an atomic nucleus. In an isotope proton number and nucleon number can only be equal if it does not have any no neutrons.

Explanation:

Hydrogen has 3 isotopes i.e. protium, deuterium and tritium.

In protium, it has only one proton and no neutron. Therefore its proton number and nucleon both are same.

In deuterium and tritium, the nucleon number and proton number are not same.

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