Science 9 Chapter 2
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Created by:
parklandsci on June 21, 2011
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21 terms
Terms | Definitions |
|---|---|
 chemical symbol | one or two letters given to a single element |
| metal | typically hard, shiny, malleable, ductile and good conductors of heat and electricity |
| non-metal | tend not to have the same properties as metals and are usually gases or brittle solids at room temperature |
| periodic table | a chart that organizes the elements according to their physical and chemical properties, gives each element's name, symbol, atomic number, atomic mass, and ion charge |
| atomic number | number of protons in the nucleus of each atom of an element, is always a whole number |
| atomic mass | an average atom of an element, always written as a decimal number |
| ion charge | an electric charge that forms on an atom when it gains or loses electrons |
| ion | an electrically charged atom |
| negative ion | an atom that has gained an electron, are elements on the right side of the table |
| positive ion | an atom that has lost an electron, are elements on the left side of the table |
| multiple ion | atoms that can form ions in more than one way |
| metalloids | elements that share some properties with metals and some properties with non-metals solids, can be shiny or dull, may conduct electricity, poor conductors of heat, brittle and not ductile. |
| metals | One of a class of elements that are good conductors of heat and electric current; metals tend to be ductile, malleable, and shiny |
| non-metals | elements on the periodic table that are usually dull in appearance, poor conductors of heat and electricity, gases at room temperature, brittle and not ductile |
| periods | each horizontal row in the periodic table |
| family | chemical families or groups are arranged in vertical column in the periodic table |
| alkali metals | metallic elements in group 1 of the periodic table which are highly reactive, have a low melting point, good electrical conductivity, and they are soft and shiny when first cut |
| alkaline earth metals | metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive |
| halogens | group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts |
| noble gases | one of the elements of group 18 of the periodic table(helium, neon,argon, krypton, xenon, and radon); noble gases are unreactive |
| Bohr Model Diagrams | ... |
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