Atom, The smallest piece of matter, made of electrons moving around a center (nucleus) with protons and neutrons., Element, A pure substance made up of one type of atom, Matter, Particles that make up everything around us., Nucleus, The central part of an atom, containing protons and neutrons, Alpha particle, A type of particle with a positive charge that’s bigger than a proton., Electron shell, Space around the nucleus where electrons circulate, Atomic number, The number of protons in an atom, Half-life, The time taken for half of a radioactive material to decay (break down), Isotopes, Atoms of the same element with the same number of protons but a different numbers of neutrons, Radioisotope, An isotope that gives off radiation, Radiotherapy, A treatment that uses radiation to kill cancerous cells, Proton, A tiny, positively charged particle found in the nucleus of an atom., Electron, A negatively charged particle that moves around the nucleus of an atom., Neutron, A neutral particle found in the nucleus of an atom..

Inside an Atom

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