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Science/ elements

periodic table of elements

element a pure substance that can't be separated or broken down into simpler substances by physical or chemical means
nonmetals elements that are dull & are poor conductors of thermal energy & electric current
pure substance a substance in which there is only one type of particle includes elements and compounds
metalloids elements that have properties of both metals & nonmetals; sometimes refered to as semi conductors
metals elemnts that are shiny and are good conductors of thermal energy & electric currrent; most metals are malleable & ductile
periodic elements that are ordered
periodic law states that the chemical or physical properties of elements are periodic functions of their atomic numbers
period a horizontal row on the periodic table
group a column of elements on the periodic table
akali metals the elements in group 1 of the periodic table; they are the most reactive metals
akaline earth metals the elements in group 2 of the periodic ; they are reactive but less reactive than the akali metals
halogens the elements in group 17 of the periodic table; they are very reactive nonmetals, & their atoms have 7 electrons in their outer level
noble gases the unreactive elements in group 18 of the periodic table; their atoms have 8 electrons on their outer level
Created by: Jman08