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Periodic Table PPT

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Periodic Table PPT
AN INTRODUCTION
TO THE
PERIODIC TABLE
OBJECTIVES
 To
describe the basic layout of
the periodic table
 To list and locate element
groups
 To describe similar properties
among groups/families
http://kevindmcmahon.com/Reseda/chemistry/documents/periodictable.gif
Periodic Table History- late 1800

Dmitri Mendeleev
Chemical properties repeat every so many elements
 Could predict unknown elements and their
properties


Henry Moseley

Arrangement by increasing atomic number
(number of protons)
INFORMATION IN EACH
BLOCK
115 elements listed and growing
 Arranged by increasing atomic number
 Vertical columns: groups
 Horizontal rows: periods

Top whole number: atomic number
 Element symbol in the middle
 Decimal number under the symbol: Atomic mass

PHYSICAL PROPERTIES
Metals
Good electrical and heat
conductors
Non-Metals
Poor conductors of heat and
electricity
Ductile - can be stretched Nonductile
into wire
Possess metallic luster
Do not possess metallic luster
Solid at room
temperature (except Hg)
Solids, liquids or gases at
room temperature
GROUP 1: ALKALI METALS
•
unusually soft
very reactive
• stored under an oil
•
GROUP 2: ALKALINE EARTH
METALS
•
•
•
not as soft as Group 1 metals
react more mildly
only react with water at
temperatures where the water is
steam
GROUP 17: HALOGENS
•
•
•
•
non-metals
strong unpleasant odor and will
burn flesh
do not dissolve well in water
react with most metals and
many non-metals
GROUP 18: NOBLE GASES
•
•
•
not very reactive
under normal conditions they do
not form compounds with other
elements
very stable
GROUPS 3 – 12:
TRANSITION METALS
•
•
Contain many everyday metals
Metal properties as listed earlier
Au - Gold
Ag - Silver
INNER TRANSITION METALS
rare
in nature
all solids
Similar properties across the
period rather than down a
group
WHAT DO YOU NEED TO KNOW
To
describe the basic layout of
the periodic table
To list and locate element
groups
To describe similar properties
among groups/families
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