# Question 5f724

Deuterium (""_1^2H)
Hydrogen-1 (""_1^1H) typically consists of a proton in the nucleus and an electron orbiting it.
Deuterium, or hydrogen-2 (""_1^2H)# is an isotope of hydrogen and like hydrogen-1 also has a single proton in the nucleus but also has a single neutron as well. Again, the electron orbits nucleus.