Are hydrogen-3 and helium-3 isotopes of same element? Explain your answer?

Question

Are hydrogen-3 and helium-3 isotopes of same element? Explain your answer?

Answer 1

If an element is an isotope it means that it has a different number of neutrons than normal. An element is identified by the number of protons it has, not the number of neutrons. If the protons are differing in number, then you have different elements.

Answer 2

No. hydrogen-3 (tritium) has a nucleus with one proton and two neutrons, and is unstable. Helium-3 has a nucleus with two protons and one neutron, and is stable.