 A chart that organizes the elements by the number of protons.
Atomic #
= number of protons = number of electrons
= number of protonsAtomic
= number mass
of electrons
= number of protons
29
Cu
Copper
=o
number
of protons
of electrons
Symbols
used=tonumber
represent
the elements.
Examples:
o Nitrogen – N
o The symbols have 1, 2 or 3 letters
o Calcium – Ca
o The first letter is ALWAYS CAPATALIZED
o Magnesium – Mg
o Any other letters are ALWAYS LOWER CASE
o Carbon - C
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.
Chemical Name
64
+ number of neutrons
Chemical Symbols
Chemical Symbol
Examples:
o Water = H2O:
2 Hydrogens, 1 Oxygen
o Salt = NaCl:
1 Sodium, 1 Chlorine
o Glucose = C6H12O6:
6 Carbons, 12 Hydrogens, 6 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