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chem 8th grade

QuestionAnswer
atomic number the number of protons in the nucleus of an atom
electron cloud a region inside an atom where electrons are like;y to be found
Dimitri Mendeleev created the first periodic table
John Dalton believed "atoms cannot be created or destroyed" #all elements made of atoms which combine to form compounds"
therm unit of heat
plastic term used to describe a material that doesn't return to its original shape after stretching
adhesive able to stick
endo internal within
exo giving out
periodic table table of the elements arranged according to their atomic number
family/group vertical column of elements on the periodic table
period horizontal row of elements on the periodic table
chemical property a property of matter that describes a substance based on its ability to change into a new substance with different properties
physical property a property of matter that can be observed or measured without changing the identity of the matter
metals elements that are shiny,ductile,malleable andare good conductors of thermal energy and electrical current
non-metals elements that are not shiny are poor conductors of thermal energy and electrical current
metalloids elements that have properties of both metals and non-metals: sometimes known as semi-conductors
insulators materials that reduce or inhibit the transfer of thermal energy and electrical current
conductors materials that conduct thermal energy and electric current well
ions a charged particle that forms during chemical changes when one or more valence electrons transfer from one atom to another
Created by: agarbutt