 A chart that organizes the elements by the number of protons.
Atomic #
= number of protons = number of electrons
Atomic mass
29
Cu
Copper
64
= number of protons = number of electrons
Chemical Symbols
Examples:
o Symbols used to represent the elements.
o Nitrogen –
o The symbols have 1, 2 or 3 letters
o Calcium –
o The first letter is ALWAYS CAPATALIZED
o Magnesium –
o Any other letters are ALWAYS LOWER CASE
o Carbon -
Chemical Formulas
o Chemical symbols put together to represent a
compound.
o The chemical formula for water is H2O.
o The 2 is a subscript. The subscript tells us how
many atoms there are of the element
IN FRONT OF IT.
Examples:
o Water = H2O:
____ Hydrogens, ____ Oxygen
o Salt = NaCl:
____ Sodium, ____ Chlorine
o Glucose = C6H12O6:
____ Carbons, ____ Hydrogens, ____ Oxygens
Name the elements that are in the following compounds:
H2SO4
There are 2 __________________ atoms, 1 __________________ atom, and 4 __________________ atoms
NaHCO3
There is 1 _________________ atom, 1 _________________ atom, 1 _________________ atom, and 3 ________________ atoms
How many atoms of each element are present in the following compounds?
HC2H3O2
There are ____ atoms of hydrogen, ____ atoms of carbon, and ____ atoms of oxygen
CaCO3
There are ____ atom of calcium, ____ atom of carbon, and ____ atoms of oxygen