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

Question

Responses

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

Hydrogen does not have any neutrons.
Hydrogen does not have any neutrons.

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

Hydrogen only has one electron

Answer 1

The statement that best explains why hydrogen’s atomic number is equal to its mass is:

Hydrogen does not have any neutrons.

This is because hydrogen, which has an atomic number of 1, typically has one proton and no neutrons, making its most common isotope (protium) have a mass of approximately 1 atomic mass unit (amu). So in this case, hydrogen's atomic number (number of protons) correlates directly to its mass since it has no significant contribution from neutrons.