Review for Chemistry
Atomic Theory and Electron Configurations
*Be sure you understand the concepts involved in each question,
Do not try to just memorize the facts!*
- Atoms, Energy and Models of the Atom
1. What is electromagnetic radiation?
2. Draw and label the electromagnetic spectrum below with at least 5 different waves!
High Energy_________________________________________________________Low Energy
3. What is the speed of light? is this constant? ____________________
4. List in order the seven colors of the visible spectrum
- which is the highest energy? lowest energy?
- from longest wavelength to shortest wavelength?
- from highest frequency to lowest frequency?
5. Describe the four models of the atom.
- What are the major differences and similarities between these four models of the atom?
- Which model do we use today? Draw and label them!
a. Thomson:
b. Rutherford:
c. Bohr:
d. Quantum Mechanical Model:
(Electron-Cloud Model)
6. Define:
- photon
- wavelength
- frequency
-1-
If an electron falls from n=6 to n=2, what color of light is given off?
If an electron goes from n=5 to n=3, what type of waves are given off?
If an electron goes from n=3 to n=1, what type of waves are given off?
Atomic Orbitals and Electron Configurations
7. What is an orbital?
- How many of each type of orbital are there?
- How many electrons does each orbital hold?
Orbital Sublevel Number of
Orbital Types
xx
Maximum number
of electrons orbital
can hold
Orbital shape
Location on
periodic table
s orbital
p orbital
d orbital
f orbital
10. Write the electron and orbital configurations for the following elements!
Element
(Symbol)
Atomic Electron Configuration
number
Li = lithium
6
1s2 2s2 2p4
F = fluorine
10
1s2 2s2 2p6 3s2 3p2
Cl = chlorine
24
1s2 2s2 2p6 3s2 3p63d64s2
Cu = copper
*Bonus*
50
Orbital Configuration
valence
e-
Element
(Symbol)
H=
hydrogen
Atomic Valence electron
number Configuration
1
4
5
6
7
8
9
10
Number of valence electrons and
group on the periodic table
(n) s1
1 valence e- = group I
8 valence e- = group VIII
Write the electron configuration for the following ions:
Na+1
S-2
How many valence electrons does the following elements have according to their electron
configurations? What period are the elements in?
1.
2.
3.
4.
1s22s22p63s23p5
1s22s22p63s23p64s23d104p65s2
1s22s22p1
1s2 2s2 2p6 3s2 3p6 4s1
What group are the following elements in:
Valence electrons
Period
B, Al, Ga _____________________
- Patterns on the Periodic Table
11. What is a valence electron? How many maximum valence electrons can an atom hold?
12. What is the number of valence electrons for each of the 8 groups on the periodic table?
Write the correct electron configurations for the valence electrons of each group.
Group
Group name
Number of Electron configuration of Metal/NonNumber
valence
valence orbital ONLY
metal/Metalloid
electrons
Group
1
I
Alkali Metals
1
(n) s
Metal
II
III
IV
V
VI
VII
VIII
13. What is atomic radius? What region of the periodic table has the largest atomic
radius? Smallest?
14. What is ionization energy? What region of the periodic table has the highest ionization
energy? Lowest?
15. What is electronegativity? What region of the periodic table has the
highest electronegativity? Lowest?
16. For the following elements:
a. Ba, Ca, Ra
b. P, Si, Al
c. Rb, Cs, K
- List the 3 elements in order from the largest atomic radius to the smallest atomic
radius. a.
b.
c.
- List the 3 elements in order from the highest ionization energy to the lowest ionization
energy. a.
b.
c.