Periodic Table Vocabulary 8th grade

unreactive non-metal group 18 on the periodic table which has a full set of valence electrons

a force that holds two or more atoms together in a compound

very reactive non-metal in group 17 on the periodic table that has 7 valence electrons

# written before chemical formula shows # atoms or molecules of substance involved in reaction

one of the elements in groups 3 through 12 of the periodic table

group 2 or more atoms held together by strong chemical forces; smallest unit of a compound

A pure substance that cannot be broken down into a simpler substance

the number of protons and neutrons in an atom

mass is neither created destroyed chemical reactions; total mass same before and after reaction

how likely an element is to form bonds with other elements

an element that is shiny, malleable, ductile, and a good conductor of heat and electricity

The smallest particle of an element that retains all the properties of that element

very reactive metal group 1  has 1 valence electron which is lost during chemical bonding

a substance that has some characteristics of both metals and nonmetals

a horizontal row in the periodic table

a vertical column in the periodic table

chemical equation that shows the same number of atoms each element on each side of the equation

abbreviation uses chemical symbols/subscripts to show the # of atoms each element in molecule

the number of protons in the nucleus of one atom of an element

number written to right and below chemical symbol identify # atoms of element in a compound

electrons in outermost shell (energy level) of atom; forming chemical bonds with other atoms.

a substance formed by a chemical reaction; on the right side of a chemical equation

reactive metal in group 2 on the periodic table that has 2 valence electrons

solid element dull-looking/brittle -not conduct heat &electricity; element gas room temperature

substance present at beginning of a chemical reaction; on the left side of a chemical equation

a substance formed when atoms of two or more elements combine chemically

a chemical reaction of oxygen with other substances