atom - the smallest unit of any chemical element, consisting of a positive nucleus surrounded by negative electrons. Atoms can combine to form a molecule, breakthrough - an important discovery or event that helps to improve a situation or provide an answer to a problem, carbon dioxide - the gas formed when carbon is burned, or when people or animals breathe out, carbon monoxide - the poisonous gas formed by the burning of carbon, especially in the form of car fuel, cell - the smallest basic unit of a plant or animal, discovery - the process of finding information, a place, or an object, especially for the first time, or the thing that is foundcell, element - a simple substance that cannot be reduced to smaller chemical parts, energy - the power from something such as electricity or oil that can do work, such as providing light and heat, experiment - a test done in order to learn something or to discover if something works or is true,

Science Vocabulary Part 1 on Page 66

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