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Part 2
Chemistry
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he Periodic Table
Period
Group or
family
Groups or families are vertical columns in the periodictable
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The zig zag line separates metals-from non metals
With the discovery of sotopes ,by Mosley in 1909 the
Periodic(Table was reorganized by increasing atomic number number
of
).protons!This is modern Periodic Table we use today
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Lightning Questions
How many protons and electrons are found in an atom of
Chlorine?
How many neutrons are found in an atom of Sodium (Na) that
has
a mass number of 23 amu? What happens to an atom when you add
another proton ? How can you change the mass number of an atom of
sodium?
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Valence Electrons
These are the electrons found in the last level of an atom.
They are the MOST important electrons in determining
thereactivity of an atom.
Elements with the same number of valence electrons will
react similarly.
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LightningQuestions!!!
How many electrons are there in an atom of Sulfur (S)? How many
valence electrons are found in an atom of Sulfur? Name an element
that would have similar chemical properties to
Sulfur.
:Click here for #Graphing Lab 2
:Click here Post Lab Clip
http://smb//tmp/svn1o.tmp/Appendix/Graph%20activity%202.dochttp://smb//tmp/svn1o.tmp/Appendix/Graph%20activity%202.dochttp://dwb4.unl.edu/ChemAnime/ATRADIID/ATRADIID.htmlhttp://dwb4.unl.edu/ChemAnime/ATRADIID/ATRADIID.htmlhttp://dwb4.unl.edu/ChemAnime/ATRADIID/ATRADIID.htmlhttp://smb//tmp/svn1o.tmp/Appendix/Graph%20activity%202.doc
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Ca +2 Cations andAnions N-3
Metals lose their valence electrons to form cations.
Click here for: Cation clip
Nonmetals will gain enough electrons to form anions. They will
take asmany electrons they need to get 8 valence electrons .
Click here for: Anion clip
http://smb//tmp/svn1o.tmp/Appendix/04_01c1.MOVhttp://smb//tmp/svn1o.tmp/Appendix/04_01d1.MOVhttp://smb//tmp/svn1o.tmp/Appendix/04_01d1.MOVhttp://smb//tmp/svn1o.tmp/Appendix/04_01c1.MOV
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FCATMultiple Choice Sample Questions
1. Mr. Lopezs science class is playing an educational game to
study the periodic table. He gives Trahn a card with some clues to
help him identify aparticular group on the periodic table . Below
is Trahns card.
2.
3.4.
FCAT Science Sample Test Book 2007
Trahn s card describes which group on the periodictable?.F Group
1.G Group 2.H Group 16.I Group 18
Which chemical group
.1 Reacts with water to form basic solutions.2 Readily combines
in nature to form other compounds
. +3 Loses 2 outer energy level electrons to form 2ions
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FCATMultiple Choice Sample Questions
Julio is given an unknown element to study. After carefully
analyzing hiselement he arrives at the following conclusions.
His element has a very low density and when it reacts with other
elements it gains 3 electrons to form an anion with a -3
charge.
In which of the following groups could we find Julios element
?
A) Group 3 B) Group 5 C) Group 13
D) Group 15
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FCATMultiple Choice Sample Questions
3. Suppose a scientist makes an unexpected discovery aboutthe
possible existence of a new element . The finding does not fitwell
with the initial hypothesis. The scientist is a member of a teamof
researchers. If the team behaves according to the bestprinciples of
scientific inquiry, which of the following would NOT
occur?
A) rejection of the finding as being impossible.B) willingness
to repeat the studies that led to the finding for
confirmation.C) urging the scientist to communicate findings to
other
researchers.D) insistence on reviewing all data carefully
and
systematically for any errors.
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Group Discussion Questionsof Key Concepts
1. What are groups and families in the periodic table?
2.
3. What are valence electrons and how are they important in
predicting an elements physical and chemicalproperties ?
4.
5. Identify the different sections of the periodic table and
predict thephysical and chemical properties of elements in
thosesections.
6.
7. What information would you need in order to predict an
unknownelement s location in the periodic table?
