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6th Grade Ch 3

Atoms, Elements, and the Periodic Table

matter anything that has mass and takes up space
atom a small particle that makes up most types of matter
law of conservation of matter states that matter is not created or destroyed, it only changes form
electron negatively charged particles surrounding an atom
nucleus the positively charged central part of an atom
proton positively charged particles in the nucleus of an atom
neutron uncharged particles found in the nucleus of an atom
element matter made up of only one kind of atom
atomic number tells the number of protons in the nucleus of an atom
isotope atoms of the same element that have a different number of neutrons
mass number the number of protons plus the number of neutrons
atomic mass the weighted average mass of all the isotopes of an element
metal elements with a shiny luster, good conductors of heat and electricity, almost all are solids at room temperature, malleable, and ductile
nonmetal elements that are dull in appearance, poor conductors of heat and electricity, many are gases at room temperature, brittle
metalloid/semi-metal elements that have characteristics of metals and nonmetals; all are solids at room temperature
substance matter with the same composition and properties throughout; elements are substances
compound a substance whose smallest until is made up of atoms of more than one element
mixture formed when two or more substances come together but don't combine to make a new substance
homogeneous mixtures can't see the different parts in this type of mixture
heterogeneous mixtures mixture that has larger parts that are different from one another; CAN see the different parts
Created by: MsHollinger