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Definition
| Elements of Group 1A except hydrogen, these are soft, shiny metals with one outer shell electron |
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| Group 2A elements which have 2 electrons in their outer shells |
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Definition
| The smallest particle of an element that retains the characteristics of the element |
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Definition
| The weighted average mass of all the naturally occurring isotopes of an element |
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Definition
| A small mass unit used to describe the mass of a very small particles such as atoms and subatomic particles |
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Definition
| A number that is equal to the number of protons in an atom |
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Definition
| An abbreviation used to indicate the mass number and atomic number of an isotope |
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Term
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Definition
| An abbreviation that represents the name of an element |
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Term
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Definition
| A pure substance consisting of two or more elements, with a definite composition, that can be broken down into simpler substances by chemical methods |
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Definition
| A negatively charged subatomic particle having a very small mass that is usually ignored in calculations |
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Term
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Definition
| The representation of an atom that show valence electrons as dots around the symbol of the element |
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Term
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Definition
| A pure substance that cannot be separated into any simpler substances by chemical methods |
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Definition
| A group of electrons with similar energy |
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Definition
| A vertical column in the periodic table that contains elements having similar physical and chemical properties |
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| A number that appears at the top of each vertical column in the periodic table and indicated the number of electrons in the outermost energy level for the A groups |
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Definition
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Term
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Definition
| A mixture of two or more substances that are not mixed uniformly |
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Term
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Definition
| A mixture of two or more substances that are mixed uniformly |
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Term
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Definition
| The energy need to remove the least tightly bound electron from the outermost energy level of an atom |
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Term
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Definition
| An atom that differs only in mass number from another atom of the same element due to having the same atomic number but different numbers of neutrons |
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Term
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Definition
| The total number of neutrons and protons in the nucleus of an atom |
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Term
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Definition
| An element that is shiny, malleable, ductile, and a good conductor of heat and electricity. They are located to the left of the zigzag line in the periodic table |
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Term
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Definition
| Elements with properties of both metals and nonmetals, located along the heavy zigzag line on the periodic table |
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Term
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Definition
| The physical combination of two or more substances that does not change their identities |
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Term
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Definition
| A neutral subatomic particle having a mass of 1 amu and found in the nucleus of an atom |
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Definition
| An element in Group 8A of the periodic table, generally unreactive and seldom found in combination with other elements |
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Term
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Definition
| An element with little or no luster that is a poor conductor of heat and electricity. They are located to the right of the zigzag line in the periodic table. |
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Term
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Definition
| The compact, very dense center of an atom, containing the protons and neutrons of the atom |
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Term
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Definition
| The region around the nucleus where electrons of a certain energy are more likely to be found |
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Term
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Definition
| A horizontal row of elements in the periodic table |
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Term
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Definition
| An arrangement of elements by increasing atomic number such that elements having similar chemical behavior are grouped in vertical columns |
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Term
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Definition
| A characteristic that can be observed or measured without affecting the identity of an element, including shape, color, odor, taste, density, hardness, melting point, and boiling point |
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Term
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Definition
| A positively charges subatomic particle having a mass of 1 amu and found in the nucleus of an atom |
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Definition
| A type of matter with a fixed composition; elements and compounds |
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Term
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Definition
| Electrons in the outermost energy level of an atom |
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