Transcript Periodic Table Slide Show Developmentx

Periodic Table of The Elements
• Steve Gerkey
• Source: Los Alamos
National Lab Interactive
Periodic Table
• www.lanl/interactiveper
iodictable
• Copyrights google
images
Element #1
Iron
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Name: Iron
Symbol: Fe
Atomic number: 26
Valence electrons: 2
Properties: Iron has been used by humans since
prehistoric times. It is found in the sun and many
stars. It is a major component in a class of
meteorites (siderites). Iron makes up the Core of
our Earth (2150 miles radius) and is the fourth
most abundant element by weight in the crust.
Element #2
Gold
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Name: Gold
Symbol: Au
Atomic number: 79
Valence electrons: 1
Properties: The most beautiful element in a
pure state, yellow color, soft metal – most
malleable and ductile. Highly prized for use in
coins, jewelry, plating.
Element #3
Oxygen
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Name: Oxygen
Symbol: O
Atomic number: 8
Valence electrons: 6
Properties: gas, forms 21% of air we breath, third most
abundant element in sun, 49% of earth’s crust. Two
thirds of the human body and 90% of water is oxygen.
Colorless, odorless, and tasteless gas. Forms ozone
(O3) which shields the earth’s surface from the sun’s
ultraviolet radiation which damages living cells. Plants
and animals rely on oxygen for cellular respiration.
Family
Slide 5
• What is a Family (Group)? In organizing the 92
natural elements in nature by Atomic Number
(# protons in the nucleus of the atom of the
element), there is a periodic or repeating
occurrence of physical and chemical
properties which is visible in the 18 columns
(family or group) of the Periodic Table. Groups
on the left are metals and on the right are
non-metals.
Alkaline Earth Metals (Group 2)
Slide 6
Valence electrons: 2
Chemical reactions: These
Elements react by transferring
The 2 valence electrons to
Another atom and become +2 ion.
Calcium is a famous element here.
Properties: Highly reactive metals,
Silvery white color, form ionic bonds
Such as CaCl, CaCO3 (shells in marine
Animals).
Halogens (Group 17)
Slide 7
Valence
Electrons: 7
Lack 1 electron
To form a complete energy shell.
Fluorine is most chemically
Active of all elements. Diatomic.
Chlorine has been used as
Poison gas in chemical warfare
And in Holocaust death camps. In
Small amounts, Cl disinfects drinking
Water and swimming pools.
Periods
Slide 8
7 Rows called Periods are
horizontal groupings.
All elements in a Period
have the same number of
energy levels (electrons in
shells)
Elements increase in atomic
number ( # Protons in
atomic nucleus) from left to
right in a period.
Period 3 of Periodic Table
Slide 9
• Elements of Period 3
have valence electrons
in the 3 energy level
(shell). Sodium Na has 1
and Argon Ar has 8.