Transcript Entrance Ticket 10/9/07

Intro to Chapter 4
We are finally learning about the atom! Please have
out last night’s homework. On the back of your
homework divide your paper into two sections.
Title the first section “K” and the second “L”.
-In the first section labeled “K”, write down
everything you think you know about atoms and
the periodic table.
Homework: Read 4.2 do # 8-10, 12,13
Entrance Ticket 9/22/14
Please have out your 4.1 and 4.2 homework
1.) Draw what you think an atom looks like
and label it 
2.) What was Rutherford’s conclusion from
the gold foil experiment?
Entrance Ticket 9/23/14
This is the symbol for the isotope
of gold that has a mass number
of 197 and gold’s atomic number
is 79.
1.) How many protons does a gold
atom have?
2.) How many electrons does a gold
atom have?
3.) How many neutrons does this
isotope of gold have?
-Write the symbol for the isotope of
carbon that has 8 neutrons.
(use the periodic table for atomic #)
Entrance Ticket 9/24/14
1.) How many protons, neutrons and
electrons are in an atom of Copper that has
a mass number of 65?
2.) Write the symbol for the isotope of
Krypton that has 58 neutrons.
Please tear out your isotopes lab (p.12).
Answers
1.) Copper-65 has 29 protons, 29
electrons and 36 neutrons.
2.)
Isotopes Lab
-If these were a real isotopes, all the brown
beans would weight the same, but they
don’t. This is the same for the white beans
and popcorn kernals.
-We will find how much each isotope weighs
on average and pretend that they all weigh
that much.
-Grades were updated and posted
yesterday you can go look at them.
-Please get out your isotopes lab.
Lead’s Average Atomic Mass
Pb-204
203.973 x 0.014 = 2.9
Pb-206
205.974 x 0.241 = 49.6
Pb-207
206.976 x 0.221 = 45.7
Pb-208
207.977 x 0.524 = 109 +
207.2
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1.) What is average atomic mass?
2.) Where is it found?
3.) How is average atomic mass different
than the mass number of an isotope?
4.) How is average atomic mass calculated?
Answers
1.) Average atomic mass is the weighted average of all
the isotopes of an element.
2.) Ave. atomic mass is found on the periodic table.
3.) Mass # is the exact number of protons plus neutrons
of an isotope. The ave. atomic mass is an average of
the mass #s of all the isotopes of an element.
4.) Ave. atomic mass is calculated by taking the mass of
each isotope times its abundance, and then adding
those values.
Entrance Ticket 9/29/14
Pass up entrance ticket #2!
1.) Please describe how you can find the number
of protons, neutrons and electrons for a given
isotope.
2.) Please write the isotope symbol for sodium23. How many protons, neutrons and
electrons does it have?
Homework: Read 5.1
Answers
1) The atomic # tells us the number of protons
and electrons. Subtract the atomic # from the
mass # to find the amount of neutrons.
2) Sodium-23
Entrance Ticket 9/30/14
Please get out last week’s 4.1 & 4.2 homework
1.) Please write the symbol for the
isotope Potassium-39.
2.) If electrons are so small that we do
not count their mass, why are they
important?
Entrance Ticket 10/1/14
Please have out yesterday’s handout
1.) What are valence electrons?
2.) Why are valence electrons so important?
Honors: Read and outline 5.2
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(1) Which atom has the electron
configuration of:
2
2
6
2
6
2
2
1s 2s 2p 3s 3p 4s 3d
(2) Please write the electron
configuration for Iron (Fe).
Entrance Ticket 10/3/14
1. Which atom has the electron
configuration of 1s22s22p63s23p64s2?
a.) What is the short hand notation for
writing this electron configuration?
b.) How many valence electrons does this
atom have?
2. What is the short cut to find the valence
electrons for “s” & “p” block elements?
Fireworks Lab
-Do not take the beaker
with you!
-Use a little bit of water and dab
the tip of the Q-tip into the salt.
Try to use both sides of Q-tip.
-Put the tip into the Bunsen
burner flame. DO NOT touch
the Q-tip to the Bunsen Burner!
Entrance Ticket 10/6/14
DO NOT WRITE THIS E.T.!
-Please have out your Fireworks Lab
-What did the lab have to do with electron
configurations?
-Why do different metals emit (release)
different colors when the are burned?
Study Guide Answers
Matching
1. J
2. G
3. A
4. C
5. F
6. E
7. D
8. B
9. H
10. I
M.C.
11. C
12. D
13. C
14. C
15. D
16. A
17. B
18. A
19.
20.
21.
22.
23.
B
B
C
D
C
Study Guide Answers
#24.)
Take the % abundance of each isotope and
change it to a decimal. Multiply the
abundance times the mass for each
isotope and then add all those values.
You should get
65.37 amu
Study Guide Answers
25) a) 1s22s22p63s2
b) 1s22s22p63s23p3
c) [Ar] 4s23d104p5
d) [Kr] 5s24d105p6
26) a.) Sulfur
b.) Neon
c.) Scandium
Due right now!
1.) Fireworks labs!
Due right now!
1.) Fireworks labs!
2.) Electromagnetic wave problems. If
your work is on more than one page,
please turn it in stapled.