Unit 2 Test
Name: ______________________
Date: _______________
Standard 2: The Atom Part 1
Circle the letter of the choice that best completes the statement or
answers the question.
1. If the electron configuration of an element is 1s22s22p63s23p5, the
element is:
a. Iron
c. chlorine
b. Bromine
d. phosphorus
2. The quantum mechanical model of the atom:
a. Is concerned with the probability of finding an electron in a
certain position
b. Was proposed by Niels Bohr
c. Defines the exact path of an electron around the nucleus
d. Has many analogies in the visible world
3. The electron configuration of calcium is:
a. 1s22s22p23s23p34s2
c. 1s22s23s23p63d8
b. 1s22s22p103s23p4
d. 1s22s22p63s23p64s2
4. The maximum number of electrons that can occupy the third energy
level of an atom is:
a. 18
c. 2
b. 32
d. 8
5. The formula 2n2 represents:
a. The numbe of sublevels in an energy level
b. The maximum number of electrons that can occupy an energy
level
c. The number of orbitals in a sublevel
d. None of the above
6. In order to occupy the same orbital, two electrons must have:
a. The same direction of spin
c. opposite charge
b. Low energy
d. opposite spin
Unit 2 Test
Name: ______________________
Date: _______________
7. (Omit CP) As the frequency of light increases, the wavelength:
a. Increases
c. decreases
b. Remains the same
d. approaches the speed of light
8. In the periodic table, there is a periodic pattern in the physical and
chemical properties of elements when they are arranged in order of:
a. Increasing atomic mass
c. increasing atomic radius
b. Increasing electronegativity
d. increasing atomic number
9. Which orbital corresponds to the transition metals on the periodic
table?
a. s
c. d
b. p
d. f
10. The representative elements are usually called:
a. Inner transition metals
c. Group B elements
b. Transition metals
d. Group A elements
11. The subatomic particle that plays the biggest role in determining the
physical and chemical properties of an element is the:
a. Proton
c. electron
b. Neutron
d. photon
12. Which of the following atoms would you expect to have the largest
atomic radius?
a. I
c. Ca
b. K
d. Rb
13. Electronegativity:
a. Generally decreases from left to right across a period
b. Is the energy change that accompanies the loss of an electron
from a gaseous atom
c. Generally decreases as you move down a group
d. Is generally higher for metals than for nonmetals
Unit 2 Test
Name: ______________________
Date: _______________
14. Which type of ionizing radiation can be blocked by clothing?
a. Alpha particle
c. X-radiation
b. Gamma radiation
d. beta particle
15. If an isotope undergoes beta emission:
a. The mass number changes
b. The atomic number changes
c. The atomic number remains the same
d. The number of neutrons remains the same
16. In nuclear fission:
a. Certain atoms break into fragments when struck by neutrons
b. A chain reaction cannot occur
c. Energy is absorbed
d. All of these
17. Nuclear fusion:
a. Occurs when large nuclei fuse together
b. Takes place in the sun
c. Generally produces hydrogen nuclei
d. All of these
Identify the elements that have the following electron configurations:
18. 1s22s22p63s23p1
__________________
19. 1s22s22p63s23p64s23d104p6
__________________
20. 1s22s22p63s23p64s23d7
__________________
Consider the elements neon, bromine, and phosphorus. Which has:
21. three electrons in its 3p sublevel?
__________________
22. its highest energy level completely filled?
23. the highest occupied energy level?
_____________
__________________
Unit 2 Test
Name: ______________________
Date: _______________
Write the electron-dot structure for the following elements:
24. He
______________________
25. K
______________________
26. Al
______________________
27. O
______________________
Tell which element in each of the following pairs has the higher
electronegativity:
28. Na, Mg
_______________________
29. Rb, I
_______________________
30. Cl, Br
_______________________
31. (Honors only!) What is the frequency of radiation whose wavelength
is 6.25 x 10-5 cm? c = 3.00 x 108 m/s
32. (Honors only!) What is the energy of a photon whose frequency is
5.2 x 1015 s-1? h = 6.626 x 10-34 J s
Unit 2 Test
Name: ______________________
Date: _______________
Be
O
1
Si
2
4 5
Ni
3
f-block
6
Th
Use the periodic table above to answer the questions below. Write the element symbol or
the number in each blank.
____
____
____
____
____
____
33. alkali metals
34. alkaline earth metals
35. a d-block element
36. an f-block element
37. halogens
38. inner transition metals
____ 39. a metalloid
____ 40. noble gases
____ 41. a p-block element
that is not a metalloid
____ 42. an s-block element
____ 43. transition metals
Unit 2 Test
Name: ______________________
Date: _______________
Write the electron configurations and orbital filling diagram for the
following elements.
44. Sulfur (S)
45. Sodium (Na)
Complete the following nuclear reactions.
46.
47.
_____ 
235
92U

0
-1
4
2He
 +
42
20Ca
+ _____
48. Iodine-131, a radioisotope, has a half-life of 8 days. If the amount
of iodine-131 in a sample is 4.0 grams, how much iodine-131 will
remain after 40 days?