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Definition
| the smallest particle of an element |
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Definition
| number of protons in atom's nucleus |
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Definition
| weighted avearge mass of an mixture of an element's isotopes |
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Term
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Definition
| particles surrounding the center of an atom that have a negative charge |
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Definition
| area around the nucleus of an atom where the atom's electrons are most likey to be found |
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Term
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Definition
| uses the symbol for an element and dots representing the number of electrons in the element's outer energy |
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Term
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Definition
| vertical column in the periodic table, all elements in the column have the same number of valence electrons |
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Term
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Definition
| atom's of the same element that different numbers of neutrons |
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Term
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Definition
| sum of the number of protons and neutrons in an atom's nucles |
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Term
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Definition
| neutral particle composed of quarks in side the nucleus of an atom |
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Term
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Definition
| postively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons |
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Term
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Definition
| horizontal row in the periodic table |
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Term
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Definition
| organized list of all known elements that area ranged by increasing atomic number and by changes in a chemical and physical properties |
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Definition
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Term
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Definition
| particles that make up protons and neutrons |
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