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Science Ch. 1 Sec.1

Chemical Interactions Elements and Atoms

neutrons small, unchanged particles that are found in the nucleus of an atom
energy level a region of an atom in which electrons of the same energy are likely to be found
protons small positively charged particles that are found in the nucleus of an atom
nucleus the central core of an atom containing protons and usually neutrons
electrons negatively charged particles that move around outside the nucleus of an atom
model physical, metal, visual, and other representation of an idea to help people understand what they cannot observe directly
scientific theory a well tested idea that explains and connects a wide range of observations
atom smallest particle of an element
mixture two or more substances elements compounds or both that are in the same place but are not chemically combined
compound a pure substance made up of two or more elements that are combined
element the simplest pure substances they cannot be broken down
matter anything that has mass and takes up space
Created by: rsummers



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