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10 Cards in this Set
- Front
- Back
atom
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the smallest unit of an element
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nucleus
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the center of the atom that contains the protons and neutrons
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orbit or energy level
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the area of the atom where the electrons are found
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neutron
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a particle in the nucleus that has no charge
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electron
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a negatively charged (-) particle that orbits the nucleus of an atom
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protons
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a particle in the nucleus that has a positive charge (+)
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periodic table
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a graphic arrangement of all the elements on the earth
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electron
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a negatively charged (-) particle that orbits the nucleus of an atom
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element
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a substance made up of only one kind of atom
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molecule
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two or more atoms joined together to form a substance
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