The energy of an electron increases as it moves closer to the nucleus. The principal quantum number indicates the energy level of an electron. There are 3 energy sublevels in the second principal energy level. When an electron moves from a lower to a higher energy level, it absorbs a quantum of energy.

1. How does the energy of anHow does the energy of an
electron change when theelectron change when the
electron moves closer to theelectron moves closer to the
nucleus?nucleus?
a.a. It decreases.It decreases.
c. It stays the same.c. It stays the same.
b.b. It increases.It increases.
d.d. It doubles.It doubles.

2. The principal quantum number
indicates what property of an
electron?
a.position
c. energy level
b.speed
d. electron cloud shape

3. What is the shape of the
3p atomic orbital?
a.sphere
c. bar
b.Dumbbell
d. two perpendicular
dumbbells

4. How many energy sublevels areHow many energy sublevels are
in the second principal energyin the second principal energy
level?level?
a.a. 11 c.c. 33
b.b. 22 d.d. 44

5. What is the maximum number ofWhat is the maximum number of ff
orbitals in any single energy levelorbitals in any single energy level
in an atom?in an atom?
a.a. 11 c.c. 55
b.b. 33 d.d. 77

6. What is the maximum number ofWhat is the maximum number of
dd orbitals in a principal energyorbitals in a principal energy
level?level?
a.a. 11 c.c. 33
b.b. 22 d.d. 55

7. What is the maximum number ofWhat is the maximum number of
orbitals in theorbitals in the pp sublevel?sublevel?
a.a. 22 c.c. 44
b.b. 33 d.d. 55

8. What is the maximum number ofWhat is the maximum number of
electrons in the second principalelectrons in the second principal
energy level?energy level?
a.a. 22 c.c. 1818
b.b. 88 d.d. 3232

9. When an electron moves from aWhen an electron moves from a
lower to a higher energy level, thelower to a higher energy level, the
electron ____.electron ____.
a.a. always doubles its energyalways doubles its energy
b.b. absorbs a continuously variableabsorbs a continuously variable
amount of energyamount of energy
c.c. absorbs a quantum of energyabsorbs a quantum of energy
d.d. moves closer to the nucleusmoves closer to the nucleus

10. The shape (not the size) of anThe shape (not the size) of an
electron cloud is determined byelectron cloud is determined by
the electron's ____.the electron's ____.
a.a. energy sublevelenergy sublevel
c.c. speedspeed
b.b. positionposition
d.d. principal quantum numberprincipal quantum number

11. The letter "The letter "pp" in the symbol 4" in the symbol 4pp
indicates the ____.indicates the ____.
spin of an electronspin of an electron c.c.
principle energy levelprinciple energy level
orbital shapeorbital shape
speed of an electronspeed of an electron

12. What types of atomic orbitals areWhat types of atomic orbitals are
in the third principal energy level?in the third principal energy level?
a.a. ss andand pp onlyonly
c.c. s, p,s, p, andand dd onlyonly
b.b. pp andand dd onlyonly
d.d. s, p, d,s, p, d, andand ff

13. According to the aufbau principle,According to the aufbau principle,
____.____.
a.a. an orbital may be occupied byan orbital may be occupied by
only two electronsonly two electrons
b.b. electrons in the same orbitalelectrons in the same orbital
must have opposite spinsmust have opposite spins
c.c. electrons enter orbitals of highestelectrons enter orbitals of highest
energy firstenergy first
d.d. electrons enter orbitals of lowestelectrons enter orbitals of lowest
energy firstenergy first

14. What is the number of electrons inWhat is the number of electrons in
the outermost energy level of anthe outermost energy level of an
oxygen atom?oxygen atom?
a.a. 22 c.c. 66
b.b. 44 d.d. 88

15. If three electrons are available to fillIf three electrons are available to fill
three empty 2three empty 2pp atomic orbitals, howatomic orbitals, how
will the electrons be distributed in thewill the electrons be distributed in the
three orbitals?three orbitals?
a.a. one electron in each orbitalone electron in each orbital
b.b. two electrons in one orbital, onetwo electrons in one orbital, one
in another, none in the thirdin another, none in the third
c.c. three in one orbital, none in thethree in one orbital, none in the
other twoother two
d.d. Three electrons cannot fill threeThree electrons cannot fill three
empty 2empty 2pp atomic orbitals.atomic orbitals.

16. How many unpaired electrons areHow many unpaired electrons are
in a sulfur atom (atomic numberin a sulfur atom (atomic number
16)?16)?
a.a. 00 c.c. 22
b.b. 11 d.d. 33

17. How many half-filled orbitals areHow many half-filled orbitals are
in a bromine atom?in a bromine atom?
a.a. 11 c.c. 33
b.b. 22 d.d. 44

18. Stable electron configurations areStable electron configurations are
likely to contain ____.likely to contain ____.
a.a. filled energy sublevelsfilled energy sublevels
b.b. fewer electrons than unstablefewer electrons than unstable
configurationsconfigurations
c.c. unfilledunfilled ss orbitalsorbitals
d.d. electrons with a clockwise spinelectrons with a clockwise spin

19. Which electron configuration ofWhich electron configuration of
the 4the 4ff energy sublevel is the mostenergy sublevel is the most
stable?stable?
a.a. 44ff66
c.c. 44ff77
b.b. 44ff1010
d.d. 44ff1414

20. Which of the following electronWhich of the following electron
configurations of outer sublevelsconfigurations of outer sublevels
is the most stable?is the most stable?
a.a. 44dd55
55ss11
c.c. 44dd99
55ss22
b.b. 44dd55
55ss22
d.d. 44dd99
55ss11

21. The quantum mechanical model ofThe quantum mechanical model of
the atom ____.the atom ____.
a.a. defines the exact path of andefines the exact path of an
electron around the nucleuselectron around the nucleus
b.b. was proposed by Niels Bohrwas proposed by Niels Bohr
c.c. involves the probability of findinginvolves the probability of finding
an electron in a certain positionan electron in a certain position
d.d. has many analogies in the visiblehas many analogies in the visible
worldworld

22. According to the HeisenbergAccording to the Heisenberg
uncertainty principle, if theuncertainty principle, if the
position of a moving particle isposition of a moving particle is
known, what other quantityknown, what other quantity
CANNOT be known?CANNOT be known?
a.a. massmass c.c. spinspin
b.b. chargecharge d.d. velocityvelocity

23. What is another name for theWhat is another name for the
representative elements?representative elements?
a.a. Group A elementsGroup A elements
c.c. Group C elementsGroup C elements
b.b. Group B elementsGroup B elements
d.d. transition elementstransition elements

24. Each period in the periodic tableEach period in the periodic table
corresponds to ____.corresponds to ____.
a.a. a principal energy levela principal energy level
c.c. an orbitalan orbital
b.b. an energy sublevelan energy sublevel
d.d. a suborbitala suborbital

25. The modern periodic table isThe modern periodic table is
arranged in order of increasingarranged in order of increasing
atomic ____.atomic ____.
a.a. massmass
c.c. numbernumber
b.b. chargecharge
d.d. radiusradius

26. Who arranged the elementsWho arranged the elements
according to atomic mass and usedaccording to atomic mass and used
the arrangement to predict thethe arrangement to predict the
properties of missing elements?properties of missing elements?
a.a. Henry MoseleyHenry Moseley
c.c. John DaltonJohn Dalton
b.b. Antoine LavoisierAntoine Lavoisier
d.d. Dmitri MendeleevDmitri Mendeleev

27. Which of the following electronWhich of the following electron
configurations is most likely to resultconfigurations is most likely to result
in an element that is relativelyin an element that is relatively
inactive?inactive?
a.a. a half-filled energy sublevela half-filled energy sublevel
b.b. a filled energy sublevela filled energy sublevel
c.c. one empty and one filled energyone empty and one filled energy
sublevelsublevel
d.d. a filled highest occupied principala filled highest occupied principal
energy levelenergy level

28. Which of the following statements isWhich of the following statements is
true about ions?true about ions?
a.a. Cations form when an atom gainsCations form when an atom gains
electrons.electrons.
b.b. Cations form when an atom losesCations form when an atom loses
electrons.electrons.
c.c. Anions form when an atom gainsAnions form when an atom gains
protons.protons.
d.d. Anions form when an atom losesAnions form when an atom loses
protons.protons.