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## Notes - An atom is made up of electrons (negatively charged particles) that move around a central nucleus, notably protons (positively charged particles) - The mass of an atom is concentrated in its nucleus which is located in the center of the atom. - An atom is electrically neutral, meaning...

## Notes - An atom is made up of electrons (negatively charged particles) that move around a central nucleus, notably protons (positively charged particles) - The mass of an atom is concentrated in its nucleus which is located in the center of the atom. - An atom is electrically neutral, meaning it has the same number of protons as electrons, which move around the nucleus. - The charge of an atom is null. - The atom is composed mostly of empty space. Its nucleus is much smaller than the atom itself.