# Introduction To The Periodic Table Of The Elements by xiaohuicaicai

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```									                    October 26, 2009

Introduction To The Periodic
Table Of The Elements
Who Came Up With The Periodic
Table Anyway?
   Dmitri Mendeleev
   Came up with cards for each element
   Put them on a wall in order of increasing
atomic mass
   It was like a game of cards, where
Mendeleev tried arranging the elements in
vertical columns and horizontal rows
The Periodic Table

What three pieces of information does each square give?
Organizing The Elements
   Every element has a group and a period:
   Group – A group is a vertical column of
elements on the periodic table of the elements
   Period – A period is a horizontal row of
elements on the periodic table of the elements
Common Groups

   Alkali Metals
   Alkaline Earth Metals
   Halogens
   Noble Gases
Alkali Metals

   Group 1
   React rapidly when exposed to air and water
   Ex:
Alkaline Earth Metals

   Group 2
   Less reactive than alkali metals
   If heated, they will burn in air
   Ex:
Halogens

   Group 17
   The most reactive non-metals
   Corrosive
   Ex:
Noble Gases

   Group 18
   Inert
   Odourless, colourless gases at room
temperature
   Ex:
Periodic Table Organizers

   Atomic Number – The atomic number is used
to organize he elements within the periodic
table of the elements
   Atomic Mass – The atomic mass is the average
mass of an elements' atom
   Where will these concepts be important?
Atomic Notation

   Atomic notation allows for the atomic
mass and atomic number of an element to
be visible.

Atomic Mass
4
Atomic Number         2
Subatomic Particle Details

   Atomic number = number of protons = number
of electrons (atoms have no overall electrical
charge)

   Atomic mass - atomic number = number of
neutrons
Subatomic Particle Example

   Ex:

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