Which statement best explains why hydrogen’s atomic number is equal to its mass?(1 point)

Hydrogen does not have any neutrons.

Hydrogen is in the first row and the first column of the periodic table.

Hydrogen has one electron and one proton.

Hydrogen is stable, with two electrons in its outer shell.

The statement that best describes the reason why the atomic number of hydrogen is equal to the mass of hydrogen is that the hydrogen does not have any neutrons.

Atomic number represents the number of protons present in an element and the element's mass number is the summation of the number of neutrons and protons present in the specific element. Considering these concepts in the case of hydrogen element are as follows:

Hydrogen contains 1 proton and thus, its atomic number is also 1.
Hydrogen does not contain neutrons in them due to its smaller-sized nucleus.
Since, having no neutrons, the hydrogen's mass number is the same as its atomic number.
Thus, the mass number and the atomic number of hydrogen are equal to 1.

Thus, we can conclude that the statement hydrogen does not have any neutrons specifically describes the reason why the atomic number of hydrogen is equal to its mass.

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