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Transcript
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
Atomic Number
4
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: