Download 20150930084161

Chapter 4 Study Guide
Section 1
 Vocabulary: nucleus
 What did Aristotle believe about matter?
 What did Democritus believe about matter?
 What was Dalton’s theory?
 What did Dalton’s model of the atom look like?
 What type of evidence did Dalton gather for his atom?
 What was Thomson’s experiment?
 How did Thomson change Dalton’s model of the atom? What did Thomson’s
model look like?
 What do we call Thomson’s model of the atom?
 What did Rutherford discover in addition to the alpha particles emitted by
uranium?
 What was Rutherford’s experiment (include the name)?
 How did Rutherford change the model of the atom? What did his model look
like?
Section 2
 Vocabulary: proton, electron, neutron, atomic number, mass number,
isotopes
 Protons:
o What charge does a proton have?
o Where is the proton located?
 Electrons:
o What charge does an electron have?
o Where is the electron located?
o Electron comes from a Greek word meaning what?
 Neutron:
o What charge does a neutron have?
o Where is the neutron located?
o Who discovered the neutron?
 How do the masses of protons, neutrons, and electrons compare?
 Know that atoms of different elements have different numbers of protons.
 The atomic number tells you the number of what two subatomic particles?
 What is the mass number?
 How do you find the number of neutrons?
 What are isotopes?
 Compare and contrast hydrogen-1 and hydrogen-2.
Section 3
 Vocabulary: energy levels, electron, cloud, orbital, electron configuration,
ground state









What was Bohr’s focus?
What did his model of the atom look like?
What do we know about energy levels?
What happens when electrons gain or lose energy?
What state is it when electrons absorb energy?
What state is it when an electron loses energy?
What is the most stable electron configuration?
What do scientists use the electron cloud model for?
When Neon atoms return from excited states to the ground state, what
happens?
*Make sure you can complete an example of Bohr’s model.
*Be able to label all of the parts of an atom.
* Be able to fill in a table of missing information on atomic number, atomic
mass, number of protons, neutrons, and electrons. (Like the homework sheet)