Transcript Isotopes

Thursday October 1, 2015
TO DO RIGHT NOW:
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Have a seat in your old seat 
Get out your HW
Copy words on page 42
Page 45- Title “Magic Squares and Atomic Structure”
Update your table of contents
HOMEWORK
1. Use Video #5 – to take notes over isotopes on the back
of your paper from today. Then write the paragraph at
the bottom of the page.
2. Study for quiz tomorrow! (over scientists and
subatomic particles)
REMINDERS
• Tutorials are 7:00-7:25 am and 2:40-3:00pm (quick questions only.
• Get scientific calculator!!!
• Check grades online!
What are isotopes?
 https://www.youtube.com/watch?v=xjY5p1CDr8&feature=youtu.be
Isotopes
All LIES!
Dalton’s Atomic Theory – the part
that states that atoms of the
same element are identical –
is NOT always true
Isotopes are atoms of the SAME
element that have DIFFERENT
numbers of NEUTRONS!
Example:
There are 3 types of Hydrogen
#p:
#p:
#p:
#n:
#n:
#n:
#e:
#e:
#e:
2 Ways to Notate an isotope
1.) Hyphen notation
Element name – mass number
Example 1: Nitrogen-15
How many protons?
______
7
7
How many electrons? ______
8
How many neutrons? ______
2 Ways to Notate an isotope
2.) Nuclear Symbol
Example 2:
238
92
U
How many protons?
How many electrons?
How many neutrons?
92
92
______
146
______
______
At your assigned station, you will
draw and label a Bohr model of
an atom. You will move around
the room once finished to look at
everyone else’s atoms.
Reminder:
1st level- max 2 e2nd level- max 8e3rd level- max 18 e-
Equations
Atomic Number =protons
A = #p+ = #eMass Number
M = # p+ + #n0
Number of neutrons
M- A = n0
Now, fill in the row for your
assigned letter. Then bring your
model to me 
Examples
Name
Symbol
Chlorine-37
37Cl
Chlorine-35
Carbon-14
Carbon-12
35 Cl
17
14C
6
12C
Mass
Number
#p
#n
#e
37
17
20
17
35
17
18
17
14
12
6
8
6
6
6
6
Now fill in the last two columns on
your isotope activity from the
beginning of class.
Homework: Answer questions 1-6