the groups of the periodic table · the groups (families) of the periodic table make a prediction:...
TRANSCRIPT
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Today’s Catalyst
• Complete the Exit Ticket from yesterday
• 1. What is the difference between Mendeleev and Moseley’s periodic tables? Write your answer in complete sentences.
• 2. How is the periodic table arranged today?
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Rows (periods): elements are put in rows by increasing atomic number Columns (groups): elements are put into columns (groups) based on how they react (chemical properties)
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Today’s Catalyst •
• 3. On the blank Periodic table below, label the following: 1)row or period; 2)column or group; 3)metals; 4)non-metals
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Do Now • Take three minutes and think about
your immediate family (mom, dad, brothers, sisters)
• On the back of the exit ticket write 2 characteristics that everyone in your family shares and 2 characteristics that you do not share with any other member of your family
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The Groups (Families) of the Periodic Table
Make a Prediction: How do you think the ‘Opening’ is going to relate to our lesson today?
TEST Tuesday!
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Column = Group = Family
• Elements in a group are like members of a family-each is different, but all are related by common characteristics.
• Knowing an element’s group can help us predict its properties and how it will react.
Is like….
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For your listening pleasure…
• The Element Song
• http://www.youtube.com/watch?v=zGM-wSKFBpo
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VERTICAL
COLUMNS
are called
GROUPS
or
FAMILIES
HORIZONTAL ROWS are
called PERIODS.
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Our Goal for Class:
• Describe the properties of chemical families including alkali metals, alkaline earth metals, halogens, noble gases, and transition metals
• Understand the relationship between valence electrons and chemical properties
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Valence Electrons
• Electrons located in the outermost electron shell that are responsible for chemical bonding.
• These electrons are either given away, taken, or shared with other elements to create a chemical bond called a compound.
• Commonly called the “hook up” electrons
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Physical Properties: solids,
silvery appearance, soft,
shiny
Chemical Properties: undergo
chemical changes easily and
sometimes violently
(especially water)
MOST important fact: the
most reactive metal group
on the periodic table
•don’t occur in nature in their
elemental form
Alkali Metals
Have 1 VALENCE
ELECTRON
GROUP 1
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VERTICAL
COLUMNS
are called
GROUPS
or
FAMILIES
HORIZONTAL ROWS are
called PERIODS.
1
(1VE)
Alkali
Metals
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The Greatest Video…EVER
http://www.youtube.com/watch?v=92Mfric7JUc
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Physical Properties: solids,
metallic, harder, denser, and
stronger than alkali metals
Chemical Properties: second
most reactive metal group
MOST important fact: less
reactive than alkali metals, but
too reactive to be found in
elemental form
Alkaline Earth Metals
Have 2 VALENCE
ELECTRONS
GROUP 2
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VERTICAL
COLUMNS
are called
GROUPS
or
FAMILIES
HORIZONTAL ROWS are
called PERIODS.
1
(1VE) 2
(2VE)
Alkali
Metals Alkaline
Earth
Metals
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Transition Metals
Physical Properties: very hard,
high boiling point, high
electrical conductivity,
malleable
Chemical Properties: less
reactive than group 1 and 2
metals
MOST important fact: occur in
nature in elemental form
Have 2-3 VALENCE
ELECTRONS
GROUPS 3-12
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VERTICAL
COLUMNS
are called
GROUPS
or
FAMILIES
HORIZONTAL ROWS are
called PERIODS.
1
(1VE) 2
(2VE)
3-12
(2-3VE)
Alkali
Metals Alkaline
Earth
Metals Transition
Metals
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Halogens Physical Properties:
nonmetals, diatomic
molecules
Chemical Properties: very
reactive, especially with
alkali metals and alkaline
earth metals
MOST important fact: most
reactive group of nonmetals
Have 7 VALENCE
ELECTRONS
GROUP 17
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VERTICAL
COLUMNS
are called
GROUPS
or
FAMILIES
HORIZONTAL ROWS are
called PERIODS.
1
(1VE) 2
(2VE)
3-12
(2-3VE)
13
(3VE)
14
(4VE)
15
(5VE)
16
(6VE)
17
(7VE)
Alkali
Metals Alkaline
Earth
Metals Transition
Metals
Halogens
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Noble Gases Physical Properties: gases at
room temperature, when
excited many of the noble
gases give off light
Chemical Properties: Do not
naturally react
MOST important fact: the
most stable group on the
periodic table (exist in
elemental form)
Have 2 or 8
VALENCE
ELECTRONS
GROUP 18
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VERTICAL
COLUMNS
are called
GROUPS
or
FAMILIES
HORIZONTAL ROWS are
called PERIODS.
1
(1VE) 2
(2VE)
3-12
(2-3VE)
13
(3VE)
14
(4VE)
15
(5VE)
16
(6VE)
17
(7VE)
18
(2 or 8
VE)
Alkali
Metals Alkaline
Earth
Metals Transition
Metals
Halogens
Noble
Gases
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Hydrogen…The “Special” One
Has 1 Valence
Electron
HIGHLY Reactive!
Plays a part in 75%
of the known
compounds in the
UNIVERSE!
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Bohr Model
Boron ? protons ? electrons
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Bohr Model
Krypton ? protons ? electrons
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Bohr Model
Potassium ? protons ? electrons
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Bohr Model
Arsenic ? protons ? electrons
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Valence Electron
• The electrons in the outermost shell of an atom
• The electrons that are available to be lost, gained, or shared in the formation of chemical compounds
Valence Electrons determine the chemical properties of elements
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How does this relate to the PT??
• The different groups of the periodic table all have distinct numbers of valence electrons which influence their chemical properties
Alkali Metals: 1 Valence electron Alkaline Earth Metals: 2 Valence electrons Transition Metals: varies Halogens: 7 Valence electrons Noble Gases: 8 Valence electrons
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Why Do Bonds Form?
What Is It All About?
Why Are We Here?
What Is The Meaning Of Life?
What Is The Driving Force Of
Our Universe?
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…and sometimes 2
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Octet Rule
• Chemical compounds tend to
form so that each atom, by
gaining, losing, or sharing
electrons, has an octet (set of
8) of electrons in its highest
occupied energy level
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Today’s Homework: • Answer the following questions in
PARAGRAPH FORMAT (5-10 sentences): – Summarize your Learning on Mendeleev,
Moseley, and the Periodic Table. Provide EVIDENCE from your notes!
– Select ONE family from the periodic table and DESCRIBE the properties of the that family (physical and chemical). How many valence electrons does this family have? How do valence electrons affect the chemical properties of the group?
• Start Studying for the TEST on TUESDAY!!!