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p.scien-chp-3 sec-2

chp. 3 sec. 2

element matter made up of only one kind of atom 90 are natural 25+ are man made /synthetic
periodic table a chart to organize the elements
symbol 1-3 letters which represent an element
periods the rows; they have the same number of energy levels
columns groups; they have similar properties
atomic number number of protons in the nucleus of each atom of an element identifies the element
isotopes atoms of the same element with different numbers of neutrons
mass number number of protons plus number of neutrons
atomic mass weighted average mass of isotopes of an element unit is atomic mass unit(u)
metals elements that are malleable,ductile,good conductors of electricity and heat, and are generally shiny(metallic luster) they arre solids at room temperature
nonmetals elements that are usually gases or brittle solid and are poor conductors of electricity and heat many are not solid at room temperature
metalliods elements with characteristics of both metals and nonmetals they are solid at room temperature
Created by: kkrahulik