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18 Cards in this Set
- Front
- Back
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Atom |
The smallest particle of an element |
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Atomic mass |
The mass of an atom in atomic mass units The average mass of the atoms of an elecment |
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Atomic mass unit |
One-twelfth the mass of the 12 6 C atom |
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Atomic number |
The number of the protons in the nucleus of an atom |
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Atomic symbol |
The abbreviation |
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Chemical symbol |
A notation using one to three letters to represent an element |
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Electron |
An elementary particle with unit negative charge |
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Group |
The elements of a vertical column in the periodic table |
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Isotope |
One of two or more atoms having the same number of protons but different numbers of neutrons |
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Mass number |
The total number of protons and neutrons in an atom |
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Metal |
An element that tends to lose electrons in chemical reactions |
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Metalloid |
An element that has properties characteristic of a metal and a nonmetal |
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Neutron |
A neutral subatomic particle, a hadron |
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Nonmetal |
An element that tends to gain electrons in chemical reactions |
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Nucleus |
The central part of an atom that contains the protons and neutrons.
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Period |
A horizontal row of the periodic table |
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Proton |
Positive nucleon |
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Subatomic particle |
A particle smaller than an atom |
