NAME:___________________________________ DATE:____________________ PERIOD:_____
Atomic Theory & Structure (Ch. 3) Study Guide

20 +Multiple Choice

6 Matching

2 Short Answer

9 Problems

Isotope Problems

Average Atomic Mass

Moles to Atoms Conversions

Atoms to Moles Conversions

Moles to Mass Conversions

Mass to Moles Conversions

Atoms to Mass Conversions

Mass to Atoms Conversions

Subatomic Particles

Law of Conservation of Mass

Law of Definite Proportions

Law of Multiple Proportions

Dalton’s Atomic Theory

Modern Atomic Theory

Subatomic Particles

Isotopes

Rutherford’s Gold Foil Experiment

Thomson’s Cathode Ray Tube
Experiment

Scientists and their Contributions:
Avogadro, Chadwick, Dalton,
Democritus, Rutherford, Thomson
1.
What is an atom?
2.
List the three types of subatomic particles and describe their characteristics including: location, charge, symbol, mass, etc.
3.
What is atomic number and where is it found on the periodic table?
4.
How do you determine the number of electrons in a neutral atom?
5.
What is mass number? Is it found on the periodic table?

Atomic Theory & Structure (Ch. 3) Study Guide
6.
What are isotopes? How do you determine the number of neutrons in an isotope?
7.
Fill in the chart below regarding isotopes:
ISOTOPE
NAME
ISOTOPE
SYMBOL
NUMBER OF
PROTONS
NUMBER OF
NEUTRONS
NUMBER OF
ELECTRONS
Nitrogen – 15
70
33
As
76 53
Aluminum - ? 15
8.
What is average atomic mass? Where is it found on the periodic table?
9.
Naturally occurring lead is composed of three isotopes: lead-206, lead-207 and lead-208. What is the average atomic mass if the abundances of these isotopes are 25% (Pb-206), 22% (Pb-207), and 53% (Pb-208)?
10.
Unknown element Z has two isotopes Z-20 and Z-22. If the abundance of Z-20 is 91% and the abundance of Z-22 is 9%, what is the average atomic mass of this element? What is the real name and symbol of element Z?
11.
Who was Democritus and what revolutionary idea did he first propose?

Atomic Theory & Structure (Ch. 3) Study Guide
12.
Describe the following laws: a.
Law of Conservation of Mass b.
Law of Definite Proportions c.
Law of Multiple Proportions
13.
Compare and contrast Dalton’s Atomic Theory with Modern Atomic Theory.
14.
Describe Thomson’s cathode ray experiment.
15.
Describe Rutherford’s gold foil experiment.
16.
What contribution did Chadwick make to knowledge about atomic structure?
17.
What is a mole?
18.
What is Avogadro’s number? Why is it called this?
19.
How many atoms are in 5.67 moles of oxygen gas?

Atomic Theory & Structure (Ch. 3) Study Guide
20.
How many moles are in 5.45 x 10 35 molecules of water?
21.
How many grams are in 3.565 moles of lead?
22.
How many moles are in 13.6 grams of aluminum?
23.
How many atoms are in 74.77 grams of silver?
24.
How many grams are in 2.86 x 10 28 atoms of bromine?