catalyst – september 34 0 + 12, 2010 monday mystery element! 1. it is an alkali metal. 2....
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Catalyst – September 340 + 12, 2010
Monday Mystery Element!
1. It is an Alkali Metal.2. According to theory, it
was one of the original elements created during the Big Bang.
3. Can be useful as a mood-stabilizing drug.
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Catalyst – Semptember 340 + 12, 2010
Monday Mystery Element!
1. It is an Alkali Metal.2. According to theory, it
was one of the original elements created during the Big Bang.
3. Can be useful as a mood-stabilizing drug.
LITHIUM
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Today’s Agenda
Catalyst New Groups Quick Atom Review Intro to Periodic Table Project Periodic Table Basics Project Work Time Exit Question
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This Week’s Schedule (9/13-9/17) Monday: Periodic Table Basics, Start
Group Project Tuesday: Bohr Models, Group Work Time Wednesday: Electron Configuration,
Group Work Time Thursday: Graphing, Periodic Trends,
Group Work Time Friday: Guest Speaker Jabreel
Walker
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Next Week’s Schedule (9/20-9/24) Monday: NO SCHOOL – Parent
Conference Night Tuesday: Library Work Day
Individual/Group Work Time Wednesday: Unit 2 Review Thursday: Unit 2 Test Friday: Project Due, Start Unit
3!
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Today’s Objectives
SWBAT describe/identify the main regions and families of the periodic table.
SWBAT begin their group project!
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Front Door
Projector3rd Period
Group 3
Ebony, Waynell,
Quanetta, Warren
Group 5
Alessandro, Bao, Kara
Group 1
Chicobi, Tashelle,
Jamie, Sara
Group 6
Kendell, Jasmine,
Corey, Kiedra
Group 2Melvin, Paula, Amber, Tigler Group 4
Brandon, Ariel, Shawn
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Front Door
Projector4th Period
Group 3
Infinity, Jytte, Lyndon, Jeremy
Group 2
Khallid, Shannon, Rodrea, Daniel
Group 1
Jon, Sam, Josh’shawn,
Kourtney
Group 6
Kentrell, Eddie, Nia,
Artrel
Group 5
Lester, Dwanyetta,
Rachel, Aaron
Group 4
Brittany, Chelsie, Troy,
Kourtney
Group 9Group 8
Stephanie, Kim, Roniece,
Caleb
Group 7
Kim, Lizzeh, Jaron, Rachel
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Major Playas of Atomic Theory
Democritus (460-370 B.C.)John Dalton (1808)J.J. Thomson (1897)
Ernest Rutherford (1909)Niels Bohr (1913)
Schrodinger (1924)
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What were Democritus’ ideas?
•Matter is composed of tiny particles called atomos
•Different kinds of particles have different sizes and shapes
•Particles move through empty space
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Democritus’ Big Contribution?
First ideas about the
atom!Named them!
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Dalton’s Big Contribution?
First real theory about
the atom!
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Thomson’s Big Contribution?
Atoms ARE divisible!
Discovered the electron!
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Rutherford’s Big Contribution?
Discovered the nucleus
and the proton!
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Bohr’s Big Contribution?
First to talk about where
electrons hang out in the atom
– ORBITS!
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Schrodinger
Instead of orbits, Schrodinger said that electrons hang out in orbitals Orbitals are like rooms that electrons
are probably in at a given moment This final Model is called the
Quantum ModelHooray!
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Schrodinger’s Big Contribution?
No to orbits!YES to ORBITALS!
(also where electrons hang
out)
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Subatomic Particles
Subatomic
Particle
Location Relative Mass
Relative Charge
Protons
Neutrons
Electrons
NUCLEUS
NUCLEUSOUTSIDE NUCLEU
S
1 amu
1 amu
1/1840 amu
(virtually zero!)
1+
NEUTRAL
1-
Relative means compared to
others
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Atomic Number
pREVIEW of the Periodic Table
Element SymbolAtomic Mass
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Atomic Math: Words to Live By1. The atomic number of an atom is
the same as the number of ___________________.
2. The number of electrons is equal to the number of _______________(in a neutral atom).
3. Atomic mass is equal to the number of _________________ plus the number of _________________.
PROTONS
PROTONS
PROTONSNEUTRONS
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Atomic Math Basics
How to find # protons? Look at PT Atomic Number
How to find # electrons? # Protons = # Electrons
How to find # neutrons? # Neutrons = Atomic Mass - # Protons
How to find atomic mass? Atomic Mass = # Protons + # Neutrons
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The Periodic Table
Key Point #1: The periodic table organizes the elements into many different groups based on physical and chemical properties.
We will learn about the major ways to group the elements – by… Family Metals/metalloids/nonmetals Valence Electrons Atomic size Electronegativity
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What does PERIODIC mean?
Key Point #2: Periodic means that there is some kind of pattern.
In the Periodic Table, there are numerous patterns What about in regular life? How could you group
the following items in different ways?
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The Evolution of the Periodic Table
Just like atomic theory, the Periodic Table also has a long history
In the late 1790s, French scientist Antoine Lavoisier compiled a list of elements known at that time - only 23!
In the 1800s, scientists began discovering a ton of elements - up to 70!
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Evolution Continued
New elements meant new data!
Scientists needed a way to organize everything!
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John Newlands (1860s)
Arranged the Periodic Table by increasing ATOMIC MASS
Noticed patterns based on physical and chemical properties - repeated every 8th element
Law of Octaves
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Newland’s Periodic TableLaw of Octaves
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Mendeleev (1869)
Arranged elements by increasing ATOMIC MASS into columns based on chemical and physical properties
Left spaces for undiscovered elements
First to publish table
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Mendeleev’s Periodic TableEMPTY SPACES!
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Mosely (1913)
Arranged elements by increasing ATOMIC NUMBER
Some of Mendeleev’s elements in the wrong order
Periodic Law
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Our Periodic Table – Thanks to Mosely
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Periodic Law
Periodic Law is the statement that there is a periodic (patterned) repetition of chemical and physical properties of the elements when they are arranged in increasing atomic number
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Periodic Table Review
1. Why is the periodic table called the “periodic” table?
2. How did Newlands organize the periodic table?
3. Who published the first periodic table?
4. Who developed periodic law?
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Basic Terms to Know
Write these in your notes to remember!
Period – horizontal rows on periodic table
Family/Group – vertical rows on periodic table
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Metals, Metalloids, and Nonmetals
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Major FamiliesAlkali Metals
Alkaline Earth Metals
Transition Metals
Halogens
Noble Gases
LanthanidesActininides
H
Be B C N O F
He
Ce
Th
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Alkali Metals
Alkali metals are very reactive – even with water!
Sodium + Water EXPLOSION!
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Alkaline Earth Metals
Alkaline Earth metals are also very reactive Shiny solids that are harder than Alkali
metals Alkaline Earth Metal Spotlight: CALCIUM
Calcium is essential for human life, especially in maintaining bones and teeth
Found widely in nature combined with oxygen Abrasives in toothpaste and emery boards
Magnesium Demo!
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Boron’s Group
Gallium is a silver metal that literally melts in your hand!
Don’t try this
yourself!
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Carbon’s Group
Carbon is one of the most important elements on Earth! There is a whole branch of chemistry
dedicated to studying carbon – ORGANIC CHEMISTRY!
If you are a science major in college, you will most likely take Organic
Silicon is the second most abundant element on Earth! Use in computer chips and solar cells Found in quartz, sand, and glass
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Nitrogen’s Group
Metals, nonmetals, and metalloids! Nitrogen, which you breathe, can
form some of the most explosive compounds known to man
Arsenic is a toxic substance that was used to treat some illnesses back in the day
Bismuth is used in fire sprinklers
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Oxygen’s Group
Oxygen We must breathe oxygen to survive…
so it’s pretty important Reacts with some of the noble gases
Sulfur Hydrogen sulfide smells like rotten egg
Selenium Used in solar panels because it can
convert light into energy
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Fluorine (really fluoride) is added to toothpaste
Chlorine gas is a deathly green gas that was first used as a form of chemical WARFARE in WWII
Halogens (Fluorine’s Group)
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Noble Gases (Helium’s Group) Noble gases do not react with other
elements very often – they are already “happy” They can be called “inert” because
they don’t react Neon is used in neon lights Helium Voice!
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Transition Metals
Conduct electricity Can form different ions (We’ll learn
more about ions later!) Many found in nature – found all
over the world (map on page 200) Uses
Found in alloys, wires, plastics, etc. Your body needs trace (small)
amounts many of them
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Group Work Time: Family Research
Pick your group’s familyStart researching info about your family
Chapter 7 in your book contains information about each family
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Exit Question
1. Why is the periodic table called the “periodic” table?
2. What is your group’s family? List two characteristics of elements in your group’s family.
HOMEWORK: PT BASICS WORKSHEET