Which particles make up an atom’s nucleus?

Protons and neutrons make up the nucleus of an atom.

Think of an atom like a tiny solar system where the nucleus is the heavy sun in the middle made of protons and neutrons packed together; electrons orbit far outside but are not part of the nucleus. Protons have a positive electrical charge and neutrons have no charge, and together their masses make the nucleus much heavier than the surrounding electrons. The number of protons determines which element you have, like how five protons means boron and six protons means carbon, while neutrons can vary and make different versions of the same element called isotopes. The strong force is what holds protons and neutrons tightly together in the nucleus even though protons repel each other because of their like charges.

A common mistake is thinking electrons live inside the nucleus, so remember electrons move around outside the nucleus, not inside it. Another confusion is believing neutrons are unimportant because they have no charge, but neutrons add mass and help stabilize the nucleus so it does not fall apart. Some students try to count mass by only adding protons and forget neutrons, so always add both to get the nucleus mass number.

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Particles in an Atom’s Nucleus

1. Atom nucleus made of protons and neutrons
2. Protons carry positive electrical charge
3. Neutrons have no electrical charge
4. Nucleus heavier than surrounding electrons
5. Proton count defines the element
6. Neutron variations create isotopes
7. Strong force holds nucleus together

Common Atom Mistakes and Misconceptions

1. Electrons live inside the nucleus
2. Neutrons are unimportant because neutral
3. Forgetting to add neutrons to mass

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