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Definition
| the smallest unit of an element that maintains the properties of that element |
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Definition
| a substance that cannot be separated or broken down into simpler substances by chemical means; all atoms of an element have the same atomic number |
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Definition
| a subatomic particle that has a negative electric charge |
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Definition
| a subatomic particle that has no charge and that is found in the nucleus of an atom |
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Definition
| an unreactive element of Group 18 of the periodic table that has 8 electrons in its outer level (except He, which has 2) |
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Definition
| an atom's central region, which is made up of protons and neutrons |
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Definition
| an element that conducts heat and electricity poorly and is found on the right side of the periodic table |
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Definition
| a subatomic particlethat has a positive charge and that is found in the nucleus of an atom |
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Definition
| an electron that is found in the outermost shell of an atom and that determines the atom's chemical properties |
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Definition
| a horizontal row of elements in the periodic table |
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Definition
| the law that states that the repeating chemical and physical properties of elements change periodically with the atomic number of the elements |
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Definition
| the sum of the numbers of protons and neutrons in the nucleus of an atom |
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Term
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Definition
| an atom, radical, or molecule that has gained or lost one or more electrons and has a negative or positive charge |
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Definition
| an atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons |
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Definition
| the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element |
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Definition
| an element that is shiny and that conducts heat and electricity well. Found on the left side of the periodic table. |
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Definition
| an element or compound that conducts electric current better than an insulator but not as well as a conductor. Found between metals and nonmetals on the periodic table (the stairsteps) |
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Definition
| groups 3-12 on the periodic table |
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Definition
| one of the elements of Group 1 of the periodic table. Extremely reactive! |
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Definition
| one of the elements of Group 2 on the periodic table. |
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Definition
| one of the elements of Group 17 of the periodic table. can combine with most metals to form salts. |
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