Q: What is an alpha particle with two protons and two neutrons called?


Read this paragraph and choose the correct option from the provided answers:

In alpha decay, energy and an alpha particle are emitted by a nucleus that is unstable because it has too many protons. An alpha particle consists of two protons and two neutrons, so it is actually a helium nucleus.

 Choices:

- chloride nucleus

- hydrogen nucleus

- hydrogen nucleus

- helium nucleus


A:
helium nucleus