Question

Which atoms have the same number of neutrons?

(1) H-1 and He-3
(2) H-2 and He-4
(3) H-3 and He-3
(4) H-3 and He-4

Answer 1

Atoms with the same number of neutrons are H-3 and He-3.

Step-by-step explanation:

All atoms of the same element have the same number of protons but can have a different number of neutrons. In this case, the atoms with the same number of neutrons are (3) H-3 and He-3. Hydrogen-3, also known as tritium, has one proton and two neutrons, while helium-3 has two protons and one neutron. Both atoms have a total of three nucleons (protons + neutrons). Therefore, (3) H-3 and He-3 have the same number of neutrons.