The Isotope Deuterium Has

Question

The isotope deuterium has
A)one proton.
B)one proton and one neutron.
C)one proton and two neutrons.
D)one proton and three neutrons.

Accepted Answer

Deuterium has one proton and one neutron, which means its atomic mass is two (one for the proton and one for the neutron). Option A is incorrect because hydrogen-1 (or protium) has only one proton and no neutrons. Option C is incorrect because it describes helium-3, which has two protons and one neutron. Option D is incorrect because it describes helium-4, which has two protons and two neutrons.