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Mrs. Bonanno
Chemistry
Name ______________________________ #____
Date ___________________ Period ____
Lesson 11: Atomic Pudding
Match each piece of evidence on the right with the correct atomic model on the left:
______ 1. Solid Sphere Model
_____ 2. Plum Pudding Model
_____ 3. Nuclear Model
_____ 4. Solar System Model
_____ 5. Proton Model
A. Alpha particles were shot at a sheet of gold foil. He found that
some went straight through while others bounced back
B. A scientist thought that matter could not be divided into smaller
pieces because chemical reactions only combine elements.
They don’t cause elements to change into other elements.
C. Alpha particles were used like bullets, and small, positively
charged particles shot out from the center of the atom
D. It was observed that when elements were exposed to flame, they
emitted colors of specific wavelength and frequency
E. After zapping atoms with electricity, negatively charged
particles were discovered
Explain why you think there are different models of the atom:
Lesson 12: Atoms by Number
Complete the following table using your periodic table.
Element
Chemical
Symbol
Atomic
Number
Number of
Protons
Number of
electrons
Number of
Neutrons
Mass Number
22
40
(Estimate from
P.T.)
Nickel
46
Draw an accurate simple atomic model of a Magnesium Atom:
Lesson 13: Subatomic Heavyweights
1. Antimony, number 51, has an average atomic mass of 121.760 amu. Predict the name for the most
common isotope of Antimony.
2.
Tungsten, atomic number 74, has an average atomic mass of 183.84 amu. Write the isotope symbol for
the most common isotope of Tungsten.
3. Selenium, number 34, has an average atomic mass of 78.96 amu. If there are two isotopes of selenium,
what are two possible numbers of neutrons? Which isotope do you think is more abundant? How do
you know?
4.
Which subatomic particle causes different isotopes to exist?
5.
Write the isotope symbol for the following isotopes:
a. Fluorine – 23
b. Molybdemum – 96
c. Osmium – 188
6. Lithium is 7.6% Lithium-6 and 92.4% Lithium-7. Calculate the average atomic mass for lithium.
(Show your setup.)
Lesson 14: Isotopia (You will need the isotope graph handed out during lesson 14)
1. Would an atom with 50 protons and a mass of 155 amu be stable?
2.
All of the elements with atomic number greater than or equal to ______ are radioactive.
3.
In your own words, explain why elements after number 20 have more neutrons than protons in the
nucleus.
Lessons 15 and 16: Nuclear Quest and Old Gold
1. Write the symbols for an alpha particle:
2.
Write the symbols for a Beta particle:
3.
An alpha particle is not a neutral atom…it has a charge of +2. Why is this true?
4.
Be sure you understand the reactions from Lesson 16 packet and homework pages.