Smallest part of matterSmallest part of matter Made of protons, neutrons, and electronsMade of protons, neutrons, and electrons Non-livingNon-living ATOM

Element a pure substance that is made entirely from one type of atom

form when two or more atoms join together chemically MOLECULE H O H HH H2H2H2H2 H2OH2OH2OH2O

COMPOUND a molecule that contains at least two different elements All compounds are molecules but not all molecules are compounds! H O H HH H2H2H2H2 H2OH2OH2OH2O

PERIODIC TABLE an arrangement of the elements in order of increasing atomic numberan arrangement of the elements in order of increasing atomic number elements with similar properties are in the same column.elements with similar properties are in the same column.

FAMILY/GROUP = COLUMNS elements have similar propertieselements have similar properties the elements in a group have the same number of electrons in their outer orbitalthe elements in a group have the same number of electrons in their outer orbital *some exceptions in the transition metals

PERIODS = ROWS Elements have the same number of atomic orbitals in a period

ATOMIC # the number of protons on the nucleus

ATOMIC MASS/MASS # # of Protons + # of Neutrons

SUB-ATOMIC PARTICLES PROTON+INSIDENUCLEUS NEUTRON0 INSIDE NUCLEUS ELECTRON- OUTSIDE NUCLEUS

VALENCE ELECTRONS O O the number of electrons in the outer shell or orbital Oxygen has 6 valence electronsOxygen has 6 valence electrons It is in the 6 th family or group on the periodic tableIt is in the 6 th family or group on the periodic table

COEFFECIENT 2H2O2H2O2H2O2H2O The large numbers in front of chemical formulasThe large numbers in front of chemical formulas Coefficients represent the number of molecules of the substance in the reaction.Coefficients represent the number of molecules of the substance in the reaction.

SUBSCRIPT 2H 2 O The small numbers to the lower right of chemical symbolsThe small numbers to the lower right of chemical symbols Subscripts represent the number of atoms of each element in the moleculeSubscripts represent the number of atoms of each element in the molecule

REACTANTS The substances that are reactingThe substances that are reacting Always written on left side of arrowAlways written on left side of arrow 6CO 2 + 6H 2 O > C 6 H 12 O 6 + 6O 2 sunlight energy

6CO 2 + 6H 2 O > C 6 H 12 O 6 + 6O 2 sunlight energy CHEMICAL EQUATION A way of representing a chemical reaction using the symbols for the participating particles

PRODUCTS The substances that are formedThe substances that are formed Always written on right side of arrowAlways written on right side of arrow 6CO 2 + 6H 2 O > C 6 H 12 O 6 + 6O 2 sunlight energy