Question

How many neutrons does hydrogen-1 have? How many neutrons does hydrogen-2 have?

Answer 1

Hydrogen-1, or protium, has no neutrons, while hydrogen-2, or deuterium, has one neutron.

Step-by-step explanation:

Hydrogen-1, also known as protium, has zero neutrons in its nucleus. On the other hand, hydrogen-2, known as deuterium, has one neutron. To be clear, the number of neutrons in an isotope can be found by subtracting the atomic number from the mass number.

Since hydrogen has an atomic number of 1 (one proton), hydrogen-1 with a mass number of 1 has 1 - 1 = 0 neutrons, and hydrogen-2 with a mass number of 2 has 2 - 1 = 1 neutron.

Answer 2

One Neutron

Step-by-step explanation:

All three forms have one proton (pink) and one electron (dark green) but differ in the number of neutrons (gray) in the nucleus. Protium, or ordinary hydrogen (top), has no neutrons. Deuterium, or hydrogen-2 (bottom left) has one neutron. Tritium, or hydrogen-3 (bottom right) has two neutrons.