Proton, protons are inside the nucleus, protons have a positive charge, protons are basic particles of an atom, Neutron, neutrons are found in the nucleus, neutrons have no electric charge, neutrons are basic particles of an atom, Electron, electrons move very fast around the nucleus, electrons are found in electron shells, electrons have a negative charge, an electron’s exact position is always changing, Chemical elements and symbols, a chemical element has only one type of atom, atoms of the same element have the same number of protons, a chemical symbol usually has one or two letters, the first letter of a chemical symbol is a capital letter, the second letter of a chemical symbol is in lower case, History of atoms, the word atom comes from atomos, atomos means too small to cut, ancient scientists believed atoms were the smallest parts of matter, scientists discovered that atoms are not solid balls, atoms have smaller parts inside
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