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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