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Definition
| Smallest particle of an element. |
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| A pure substance that contains only one kind of atom. |
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Definition
| The positive particle found in the nucleus of an atom. |
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Definition
| A particle found in the nucleus of an atom that has no charge. |
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Definition
| The negatively charged atom found in an atom. |
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Term
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Definition
| The small, dense, central core of an atom. |
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Definition
| Orbits found outside the nucleus an atom in which electrons travel. |
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Definition
| The mass of a single proton or neutron; amu. |
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Term
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Definition
| The number of protons in the nucleus of an atom. |
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Term
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Definition
| The total number of protons and neutrons in the nucleus of an atom; it's found by rounding off the atomic mass to the nearest whole number. |
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Term
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Definition
| The sum of the relative masses of the protons and neutrons of an atom. |
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Definition
| Atoms of the same element that have a different number of neutrons. |
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Term
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Definition
| An atom or group of atoms that have an electric charge as the result of losing or gaining electrons. |
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Term
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Definition
| The organization of elements by atomic number into a table: similar elements are grouped in horizontal rows (periods) and vertical columns (groups). |
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Term
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Definition
| A horizontal row of elements in the table;7 rows=7 periods |
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Term
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Definition
| Sets of elements arranged in vertical columns in the periodic table;18 groups;groups are often called families. |
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Term
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Definition
| Elements that tend to LOSE electrons easily; they are located on the left of the staircase on the periodic table. |
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Term
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Definition
| Elements that tend to GAIN electrons easily; they are located on the right of the staircase on the periodic table. |
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Term
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Definition
| Substances that exhibit some,but not all, of the properties of metals. |
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