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| States that when the elemnts are arranged by increasing atomic number, there is a perodic repetition of their properties |
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| a vertical column of elements in the periodic table arranged in order of increasing atomic number;also called a family |
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| a horizontal row of elements in the modern periodic table |
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| Elements from groups 1, 2, and 13-18 in the modern periodic table, possessing a wide range of chemical and physical properties |
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| Elements in groups 3-12 of the modern periodic table and are further divided into transition metals and inner metals |
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| An element that is solid at toom temperature, a good conductor of heat and electricity, and generally shiny |
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| Group 1 elements, execpt for hydrogen, they are reactive and usually exist as compounds with other elements |
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| Group 2 elements in the modern periodic table and are highly reactive |
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| Any of the set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) in the periodic table |
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| the elements on the two rows which appear underneath the main body of the periodic table |
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| the rare-earth elements with atomic numbers 57 through 71; having properties similar to lanthanum |
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| a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium. |
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| (nonmetal) nonmetallic: not containing or resembling or characteristic of a metal; "nonmetallic elements". |
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| 1.Any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table |
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| Any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table |
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| An element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. |
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| An atom or molecule with a net electric charge due to the loss or gain of one or more electrons. |
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| The term ionization energy (EI) of an atom or molecule is the minimal energy required to remove (to infinity) one mole of electrons |
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| Refers to the principle that bonded atoms share their eight outer electrons. The octet rule is a 'rule' that is sometimes broken. |
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| the tendency of an atom or radical to attract electrons in the formation of an ionic bond |
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| an electron in the outer shell of an atom which can combine with other atoms to form molecules. |
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