Question

helium-4 and helium-5 are two isotopes of helium. assuming we are talking about neutrally charged isotopes, which of the following statements would accurately compare the two isotopes. a they have a different number of electrons b they have a different number of neutrons c they have a different number of protons. d they are exactly the same because they are both helium

Answer 1

The statement that would compare the two isotopes of helium is b: they have a different number of neutrons

Isotopes is the word used in chemistry for the atoms of the same element that have different numbers of neutrons but consist of the same number of electrons and protons. The difference in the number of neutrons between the isotopes of an element illustrates that the various isotopes have different masses from each other.

Helium-4 and helium-5 differ in the number of neutrons as helium-4 has 2 neutrons and is the most stable isotope of helium. On the other hand, helium-5 is an unstable isotope consisting of three neutrons.

As isotopes do not differ in the number of protons and electrons; both these isotopes of helium have two protons.

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