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10 Cards in this Set
- Front
- Back
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atom |
the basic unit of a chemical element. |
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electron |
a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. |
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nucleus |
the central and most important part of an object, movement, or group, forming the basis for its activity and growth. |
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proton |
a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign. |
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energy level (orbit, shell) |
the fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have. |
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neutron |
a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen. |
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atomic number |
the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table. |
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isotope |
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element. |
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mass number |
the total number of protons and neutrons in a nucleus. |
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atomic mass |
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes. |
