Chapter 4 Study Guide –
All of this information is in your notes or on quizzes we have completed in class. Please
come prepared to ask any questions tomorrow
1. Know all vocabulary words and definitions:
Electrons, nucleus, proton, neutron, atomic number, mass number, isotope, unified
atomic mass unit, mole, orbital, valence electron, photon
2. Development of Atomic Theory
A. What did Thomson Discover?
B. Who’s model states that negatively charged electrons orbit a positively charged
nucleus?
C. Why was Democritus’s original theory revised?
D. What is Dalton’s atomic Theory?
E. Who determined atoms positive charge is in center of atom?
F. What did Dalton say about atoms of different elements?
G. Thomson discovered info about atoms during an experiment using what?
3. Structure of an atom
A. How do you determine the number of neutrons in an atom?
B. Know what charge protons, neutrons, and electrons have.
C. Two different isotopes of an element have different what?
D. What is in a nucleus of an atom?
E. Know how to convert from grams to moles and moles to grams.
F. Why do atoms have no electric charge?
G. What is Avagrado’s number? What is it useful for?
H. What is the atomic number equal to?
4. Modern Atomic Theory
A. Bohr’s model states what about electrons?
B. What determines the number of energy levels filled in an atom?
C. What are the four types of orbitals?
D. Can the exact position of an electron be determined?
E. When does an electron jump to a new energy level?
F. Where are electrons found, in terms of energy levels?
G. How do electrons behave?
H. What do valence electrons determine?
** You will have to fill in a table to figure out number of protons, neutrons, electrons,
atomic number and atomic mass
** You will have to look at diagrams to determine number of protons, neutrons,
electrons, atomic number and atomic mass as well as which ones are isotopes of each
other.
You may use one 3 X 5 notecard on the test.
I will give you the formula for converting mols to grams and grams to mols.