Name:______________________________________________________Pd:________Date:___________________
Section 2: Quantum Theory and the Atom
1. According to Bohr’s atomic model, which letter(s) in the figure represents a place where an electron
cannot be?
a. A
b.
B, C and E
c. A and D
d. D
2. According to the quantum mechanical model of the atom, point E in the figure represents a
a. point where an electron cannot be.
b. position where an electron probably is.
c. position where an electron must be.
d. point beyond which no electron can go.
3. Which, if any, of the atomic emission spectra can the Bohr model explain?
4. For each item in Column A, write the letter of the matching item in Column B.
Column A
Column B
_______ The modern model of the atom that treats
electrons as waves
a. Heisenberg uncertainty
principle
______ States that it is impossible to know both the
velocity and the position of a particle at the same
time
b. Schrödinger wave
equation
______ A three-dimensional region around the nucleus
representing the probability of finding an electron
c. quantum mechanical
model of the atom
d. atomic orbital
______ Originally applied to the hydrogen atom, it led to
the quantum mechanical model of the atom
5. Compare and contrast the Bohr and quantum mechanical models of the atom.
6. Explain why the location of an electron in an atom is uncertain using the Heisenberg uncertainty
principle and de Broglie’s wave-particle duality. How is the location of electrons in atoms defined?
7. What is the shape of an s orbital?
8. What is the relationship between the size
of an s orbital and the principal energy
level in which it is found?
9. What is the shape of a p orbital? How
many p orbitals are there in a sublevel?
10. How many electrons can each orbital hold?
11. Look at the diagrams of the p orbitals. What do x, y, and z refer to?
12. How many d orbitals are there in a given sublevel? How many total electrons can the d orbitals in a
sublevel hold?
13. Which d orbitals have the same shape?
14. What point in each diagram represents an atom’s nucleus?
15. How likely is it that an electron occupying a p or a d orbital would be found very near an atom’s nucleus?
What part of the diagram supports your conclusion?