relativity, a theory of physics about the relationship between space, time, and energy, equation, something you write using mathematical symbols to show that two amounts are the same, element, something such as hydrogen, oxygen, or aluminium, atom, the smallest part of a substance that can be part of a chemical reaction, nucleus, the central part of an atom, calculation, something that you think about and work out mathematically, electron, a very small piece of matter that moves around the nucleus of an atom, radioactivity, when a substance produces powerful and harmful rays, velocity, the speed of something in a given direction.

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