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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