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12 Cards in this Set

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matter
anything that has mass and takes up space.
element
a substance that cannot be broken downinto any other substances by a chemical or physical means.
compound
A substance made of two or more elements chemically combined in a specific ratio or porportion.
mixture
two or more substances that are mixed together but no chemically combined.
atom
the smallest particle of an element
scientific theory
a well tested idea that explains and connects a wide range of observations.
model
a physical mental visual and othe representaions of an idea to help people understand a concept they cannot observe directly.
electrons
Negatively charged particles that move outside the neucleus of an atom.
nucleus
The central core of the atom containing protons and usually neutrons.
protons
small positively charged particles that are found in the neucleus of an atom.
energy level
The specific amount of enegy an electron has.
neutrons
small uncharged particles that are foundin the neucleus of an atom.