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3 Cards in this Set
- Front
- Back
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Atom
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-the basic unit of matter
-an atom is the smallest particle of an element that still has all the properties of the element. -Atoms are made up of smaller particles called protons,neutrons,and electrons. the smaller electrons orbit around a central nucleus of protons and neutrons |
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Atomic Number
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-the number of protons in the nucleus of an atom.
-for example, any atom with two protons is an atom of helium. -The symbol for the atomic number is Z. -In an element symbol, the atomic number is shown at lower left. |
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Electron
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-A negatively charged particle that moves around the nucleus.
-the mass of an electron is less than one thousandth of the mass of a proton |
