the periodic table organizing the elements. basic layout the periodic table consists of 18 vertical...
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The Periodic TableThe Periodic TableOrganizing the ElementsOrganizing the Elements
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Basic Layout
•The Periodic Table consists of 18 vertical columns called Families or Groups
•As well as 7 horizontal rows called Periods or Series
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The First Periodic The First Periodic TableTable
The First Periodic The First Periodic TableTable
‣Developed by Dmitri Mendeleev in 1869.Developed by Dmitri Mendeleev in 1869.
‣Organized elements by order of Organized elements by order of increasing massincreasing mass
‣Revealed the Law of Periodicity Revealed the Law of Periodicity (repeating patterns in the properties of (repeating patterns in the properties of elements)elements)
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Families (or Groups) of Elements
Groups of elements are numbered from left to right, from 1 to 18
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Elements in the same Family (or
Group)•Share similar chemical and physical properties
•This is due to their identical outer electron arrangement (these outer electrons are called valence electrons)
Lithium Sodium Potassium
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Periods (or Series) of Elements
The two detached rows at the bottom of the Periodic Table are actually a part of Periods 6 and 7. They are placed at the bottom for convenience. The Periodic Table would be
much wider if they were placed in the spot marked in orange.
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Mostof the elements on the
Periodic Table are metals
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Metals and Nonmetals
The red staircase line divides the metals from the nonmetals. Metals are located on the left, nonmetals on the right. The only exception to this division is the element Hydrogen, which is located in the upper left corner.
H
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Naturally Occurring Elements
• Another important group …doesn’t exist as single atoms …but as two atoms joined together.
Diatomic Gases
9
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Figure 3.14: Nitrogen gas contains NXN
molecules.
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Figure 3.14: Oxygen gas contains OXO
molecules.
Copyright © by McDougal Littell. All rights reserved.
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“Silly Seven”
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Manyof the groups of elements
have special names
“Halogens”
“Noble Gases”
“Transition Metals”
“Alkaline Metals”
“Metalloids”
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Each of these families is made up of several elements that share some fairly unique properties. In fact, elements are grouped on the Periodic Table according to their shared properties. Elements within a family are very similar to one another.
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Alkaline MetalsGroup 1
‣VERY reactive‣Soft metals‣Lithium, Sodium, Potassium Potassium reacting
violently with water
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Alkaline Earth Metals
Group 2
‣Not as reactive as Group 1‣Fairly soft metals
Magnesium reacting with air
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Transition Metals
Groups 3 - 12‣Varied properties‣Tend to show extremes of metals (highest density, melting point, etc.)
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HalogensGroup 17
‣VERY Reactive‣State of matter varied (two gases, a liquid, and 2 solids)
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Noble GasesGroup 18
‣Non-reactive (inert)‣Will not form compounds with other elements