PERIODIC TABLE
HISTORY
 Mid-1800’s
 60 elements identified
 5 were nonmetal gases @ room
temperature. H2, O2, N2, F2, Cl2.
 Liquids – Hg, Br
 Rest were solids with varying
properties.
History cont…
 Placement of similar property
elements.
 Dimitri Mendeleev – Russian
 Periodic Table resembles Calendar.
 What other exhibits of periodicity?
 Atoms of different elements have
different Mass.
 Atomic weights assigned.
History cont…
 Combining Capacity- 1 of two ways
to organize elements.
 ECl – “Element combining with”
Chlorine. 1 to 1 combinations. (KCl,
CsCl)
 MgCl2 – Magnesium Chloride, ECl2
Atomic Number
 The number of protons in an atom.
 Distinguishes different elements.
Nucleus
 “Center” of atom that is an area of +
positive charge.
 Along with NEUTRONs…protons
make up the MASS NUMBER.
Isotopes
 Atoms of the same atomic number(# of
protons), can have different MASS #. They
are called ISOTOPES.
 Atoms of the same element, but with
different mass number.
 Carbon 12
 Carbon 14
Table Sections
Metals
Mettaloids
NonMetals
Rows & Columns
Rows – Periods
Columns – Family
 Hockey
 Tree
Names of Families









Alkali Metals
Alkalia Earth Metals
Transition Metals
Boron Group
Carbon Group
Nitrogen Group
Oxygen Group
Halogen Group
Noble Gases