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CPT 3 PT 2

elements matter made up of only one kind of atom
#of natural and synthetic 90 natural 25+ synthetic
periodic table chart to organize elements
symbol 1-3 letters which represent an element
periods (rows) same as number of energy levels
columns (groups) similar properties
atomic number number of protons in the nucleus of each atom of an element; defines the element
three numbers that are always the same protons electrons atomic number
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 unit (u)
metals elements that are malleable, ductile, good conductors of electricity, and generally shiny (metallic luster) solids at room temperature
nonmetals elements that are usually gasses or brittle and poor conductors of electricity and heat many solids of both many solids at room temperatures
metalloids elements with characteristics of both metals and nonmetals; solids at room temperature
Created by: kisland17