Protons, Neutrons and Electrons Flashcards

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Name the three main particles that make up an atom.

They are protons, neutrons and electrons.

They are found in the nucleus at the centre of the atom.

Electrons move around the nucleus in shells (energy levels).

Protons are +1, neutrons are 0, and electrons are −1.

Protons have mass 1, neutrons have mass 1, electrons have a very small mass (almost 0).

It is the number of protons in the nucleus of the atom.

It is the total number of protons and neutrons in the nucleus.

Neutrons = mass number − atomic number.

In a neutral atom, the number of protons equals the number of electrons.

The positive charges from protons and the negative charges from electrons cancel out.

Atoms of different elements have different numbers of protons.

A proton is shown as p, a neutron as n, and an electron as e−.