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Atomic Chemistry

TermDefinition
Atom a small particle that is the building block of matter
Atom the smallest piece of an element that still represents that element
Electron a negatively charged particle that occupies the space in an atom outside the nucleus
Nucleus the region in the center of an atom where most of an atom’s mass and positive charge are concentrated
Proton positively charged particle in the nucleus of an atom
Neutron a neutral particle in the nucleus of an atom
Electron Cloud the region surrounding an atom’s nucleus where one or more electrons are most likely to be found
Element a substance that consists of only one type of atom
Molecule two or more atoms that are held together by covalent bonds and act as a unit
Compound a substance containing atoms of two or more different elements chemically bonded together
Chemical Bond a force that holds two or more atoms together
Crystal a repeating three-dimensional pattern of atoms
Physical Property a characteristic of matter that you can observe or measure without changing the identity of the matter
Chemical Property the ability or inability of a substance to combine with or change into one or more new substances
Physical Change a change in the size, shape, form, or state of matter that does not change the matter’s identity
Chemical Change a change in matter in which the substances that make up the matter change into other substances with different chemical and physical properties
Reactant a starting substance in a chemical reaction
Product a substance produced by a chemical reaction
Law of Conservation of Mass states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction
Created by: Mr. Hope