Basic Background on the periodic table and small summary of 3 elements.

1. THE PERIODIC TABLE
BROUGHT TO YOU BY:
MARLEE EVANS

2. DEVELOPMENT OF THE
PERIODIC TABLE
In 1869, Dmitri Mendeleev
created the Periodic Table.
He put the known
elements of his time in
order of atomic weight,
then grouped them into
rows and columns based
on their chemical and
physical properties.

3. ELEMENT ARRANGEMENT ?
They are arranged by proton Eight vertical groups share
number. similar properties and have
Metals are found on the left side the same number of valence
of the periodic table and non- electrons.
metals are on the right. The elements are also
Some elements found between arranged horizontally in
metals and non-metals are Periods. The Period an
metalloids, which have element is in indicates the
properties similar to both number of electron shells
metals and non-metals. the atom has.

4. ELEMENT RELATIONSHIP?
Elements are grouped
together by their
physical and chemical
characteristics.

5. ELEMENT
RELATIONSHIP BASED
Atomic mass increases
towards the right.
Vertical groups have
similar properties.
Non-Metals on
the left.
Metals on the right.
Horizontal periods
have the same number
of atomic orbitals.

6. IRIDIUM
Atomic number: 77
Element symbol: Ir
Atomic Mass: 192.217
Additional Info: Transitional
Metal, one of the least
abundant elements in the
Earth's crust, and is used for
hardening platinum.

7. ASTATINE
Atomic number: 85
Element symbol: At
Atomic Mass: 210
Additional Info: Elemental
astatine has never been viewed,
because a mass large enough to
be seen by the naked eye, would
be immediately vaporized by the
heat generated by its own
radioactivity.

8. BARIUM
Atomic number: 56
Element symbol: Ba
Atomic Mass: 137.327
Additional Info: Barium is and
Alkaline Earth Metal and is
added to steel and cast iron to
reduce the size of carbon
grains within the
microstructure of the metal.

9. SOURCES CITED
Dayah, Michael. Dynamic Periodic Table. 1 Oct. 1997. Web. 27 Oct 2012 <http://
www.ptable.com>.
Helmenstine, Anne M. "Iridium Facts." About.com Chemistry. N.p., n.d. Web. 27 Oct.
2012. <http://chemistry.about.com/od/elementfacts/a/iridium.htm>.
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