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| when elements are arranged in order of increasing atomic number, elements with similar properties appear at regular intervals. |
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| the arrangement of elements in order of their atomic number so that elements with similar properties fall in the same column or group |
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| 18 vertical columns on the periodic table. Elements in the same group have similar physical and chemical properties. |
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| 7 horizontal rows; elements in the same period have different physical and chemical properties. |
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| What are the 4 sublevel blocks of the periodic table? |
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| What group does Alkali metals belong in? They are highly reactive, silver, soft, never found free in nature, reacts violently with water, stored in kerosene, low melting points, and low density. |
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| What group does Alkaline metals belong to? They are harder, denser, strong than alkalies, have higher melting points, less reactive but too reactive to be found in nature. |
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| what block contains group 1-2? |
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what block contains group 3-12?
They are called transition elements. all metals, good conductors of electricity, high luster, less reactive than groups 1+2. |
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| what block contains group 13-18? |
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| mostly brittle solids that have properties of both metals and nonmetals |
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| sandwiched between groups 3 and 4 in the 6th period; includes elements 57-71; shiny metals similar in reaction to the alkalines. |
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| sandwiched between groups 3 and 4 in the 7th period. includes elements 89-103; all are radioactive; 1st 4 found on earth, the remainder produced in laboratories. |
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| 1/2 of the distance between the nuclei of identical atoms that are bonded together. |
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| the amount of energy needed to remove one electron from a neutral atom |
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| an atom or group of atoms that has a positive or negative charge |
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| any process that results in the formation of an ion |
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| the energy that is associated with adding an electron to an atom. |
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| how the radii of an ion compares to the overall size of the parent atom before gaining or losing an electron |
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| positive ion; formed by losing an electron; metals |
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| negative ion; formed by gaining an electron; nonmetals |
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| a measure of the ability of an atom in a chemical compound to attract electrons |
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| the electrons available to be gained, lost, or shared in the formation of a chemical compound. |
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