Transcript The Periodic Table - Duplin County Schools

The Periodic Table
Describe the Periodic Table
Describe the Periodic Table
• The periodic table is a chemistry
reference
• It arranges all the known elements in
an informative grid
Describe the Periodic Table
• Elements are arranged left to right
and top to bottom in order of
increasing atomic number
• This order usually coincides with
increasing atomic mass
Describe the Periodic Table
• The Table's pattern and arrangement
shows the arrangement of electrons in the
atom.
• Elements have different atomic numbers the number of protons or electrons
increases up the table as electrons fill the
shells.
Describe the Periodic Table
Elements have different atomic masses - the
number of protons plus neutrons increases
up the table.
• Rows - elements of each row have the
same number of energy levels (shells).
• Columns - elements have the same
number of electrons in the outermost
energy level or shell (one to eight).
Describe the Periodic Table
• The different rows of elements are called
periods.
– The period number of an element signifies the
highest energy level an electron in that
element occupies
• The different columns of elements are
called groups or families
– Elements in the same family have similar
properties
Describe the Periodic Table
Describe How To Read The
Periodic Table
Describe how to read the periodic
table:
• Every table has:
Describe how to read the periodic
table:
Atomic Number
The number of protons in an atom identifies
the element.
The number of protons in an atom is
referred to as the atomic number of that
element.
Describe how to read the periodic
table:
Atomic Symbol:
The atomic symbol is one or two letters
chosen to represent an element ("H" for
"hydrogen," etc.).
These symbols are used every where in the
world
Usually, a symbol is the abbreviation of the
element or the abbreviated Latin name of
the element.
Describe how to read the periodic
table:
Atomic Mass:
The atomic mass is the average mass of
an element in atomic mass units ("amu").
Though individual atoms always have a
whole number of amus, the atomic mass
on the periodic table is shown as a
decimal number because it is an average
of all the isotopes of an element.
Click the link below for an
interactive and informative
periodic table.
http://www.chemicalelements.com/
Click the link below for an
amazing pictorial periodic table.
http://www.chemsoc.org/viseleme
nts/pages/periodic_table.html