UNIT
2 Self-Quiz
K/U
Knowledge/Understanding Knowledge
For each question, select the best answer from the four
alternatives.
1. Which of the following is true about the proton? (3.1) K/U
(a) It is negatively charged.
(b) It was the last subatomic particle to be
discovered.
(c) Its mass is less than that of an electron.
(d) It is located in the nucleus.
2. How many neutrons does the argon isotope 37
18Ar
contain? (3.1) K/U
(a) 18
(b) 19
(c) 37
(d) 55
3. Which subatomic particles are located in the nucleus
of the atom? (3.1) K/U
(a) protons and neutrons
(b) protons and electrons
(c) neutrons and electrons
(d) protons, neutrons, and electrons
4. What happened when Ernest Rutherford fired alpha
particles at a thin piece of gold foil? (3.1) K/U
(a) Most of the alpha particles bounced straight back,
and a few went straight through.
(b) All of the alpha particles were scattered at
different angles.
(c) Most alpha particles went straight through, a
few were scattered at different angles, and some
bounced straight back.
(d) All of the alpha particles went straight through.
5. What is the mass number of an atom that contains 3 protons and 4 neutrons? (3.1) K/U
(a) 1
(b) 3
(c) 4
(d) 7
6. What are isotopes? (3.1) K/U
(a) atoms with the same number of protons but a
different number of electrons
(b) atoms with the same number of protons but a
different number of neutrons
(c) atoms with the same mass number but a different
number of neutrons
(d) atoms with the same mass number but different
atomic numbers
270 Unit 2 • Structure and Properties of Matter
436900_Chem_CH04_P255-279.indd 270
T/I
Thinking/Investigation C
Communication A
Application
7. The Bohr model of the atom
(a) applies to all atoms except hydrogen
(b) explains the hydrogen emission spectrum
(c) explains continuous spectra
(d) is the current model of the atom (3.2) K/U
8. When is a line spectrum produced? (3.2) K/U
(a) when white light is passed through a prism
(b) when excess energy is released by the emission of
light of various wavelengths
(c) when electrons are emitted from the surface of a material
(d) when electromagnetic energy is emitted from a
black object that has been heated
9. How many sublevels can be present in the third
principal energy level? (3.4) K/U
(a) 3
(c) 9
(d) 12
(b) 6
10. What are the possible values of ml for l 5 1? (3.4) K/U
(a) 0
(c) 22, 21, 0, 1, 2
(d) 23, 22, 21, 0, 1, 2, 3
(b) 21, 0, 1
11. Which of the following lists the allowed subshells for
n 5 3? (3.4) K/U
(a) 1s, 2s, 2p, 3s, 3p, 3d
(b) 3s, 3p
(c) 3s, 3p, 3d
(d) 3s, 3p, 3d, 3f
12. According to the aufbau principle,
(a) it is impossible to know the exact position of an
electron
(b) electrons are added to the lowest-energy orbital
available
(c) the lowest energy configuration for an atom is the
one that has the maximum number of unpaired
electrons
(d) energy can exist only in discrete amounts (3.5) K/U
13. What is the electron configuration of the sodium
atom? (3.5) K/U
(a) 1s22s22p63s1
(b) 1s22s22p63s2
(c) 1s22s22p23s23p2
(d) 1s22s22p1
14. Which of the following elements has 3 valence
electrons? (3.5) K/U
(a) lithium
(c) titanium
(b) magnesium
(d) aluminum
NEL
5/3/12 9:55 AM
15. Which element has the electron configuration
1s22s22p63s23p64s23d104p5? (3.5) K/U
(a) Br
(c) Pb
(b) Cl
(d) Kr
16. Which of the following correctly matches the group
name and the group label on the periodic table? (3.5) K/U
(a) noble gases — 18
(b) alkali metals — 2
(c) halogens — 16
(d) alkaline earth metals — 13
17. The sodium ion, Na1, has
(a) 11 protons and 11 electrons
(b) 11 protons and 10 electrons
(c) 12 protons and 11 electrons
(d) 10 protons and 11 electrons (4.1) K/U
18. A bromide ion has the same number of electrons as
(a) I
(c) Ar
(b) Cl
(d) Kr (4.1) K/U
19. What type of bond is formed by the transfer of
electrons between atoms? (4.1) K/U
(a) ionic bond
(b) polar covalent bond
(c) non-polar covalent bond
(d) coordinate covalent bond
20. Which of the following compounds would you expect
to have covalent bonds? (4.1) K/U
(a) KCl (c) CO2
(b) Na2O (d) BaS
21. What type of molecular geometry results from 4 shared
electron pairs around the central atom? (4.2) K/U
(a) linear
(c) trigonal planar
(b) bent
(d) tetrahedral
22. From its Lewis structure, how many lone electron pairs are there on nitrogen in nitric acid, HNO3(aq)?
(4.2) K/U C
(a) 0
(c) 2
(b) 1
(d) 3
23. Which of the following molecules has a linear shape?
(4.2) K/U
(a) BeCl2 (c) H2S
(b) H2O (d) CCl4
24. Which element has the lowest electronegativity? (4.3) K/U
(a) F
(c) At
(b) H
(d) Fr
NEL
436900_Chem_CH04_P255-279.indd 271
Indicate whether each statement is true or false. If you think
the statement is false, rewrite it to make it true.
25. The electron is the most massive particle in an atom.
(3.1) K/U
26. The neutron is a negatively charged subatomic
particle. (3.1) K/U
27. A radioisotope is an isotope that emits subatomic
particles. (3.1) K/U
28. Most of the mass of an atom is concentrated in a
positive, dense centre called the nucleus. (3.1) K/U
29. A line spectrum results when white light is passed
through a prism. (3.2) K/U
30. The movement of an electron to a different energy
level is called a transition. (3.2) K/U
31. John Dalton originated the idea that the electron also
exhibits wave properties. (3.3) K/U
32. The Heisenberg Uncertainty Principle states that it
is impossible to know the speed and position of an
electron at the same time. (3.3) K/U
33. According to the Pauli exclusion principle, in a
given atom, 2 electrons can have the same set of four
quantum numbers. (3.4) K/U
34. The valence electrons are the electrons in an atom
that can be gained or lost in a chemical reaction. (3.5) K/U
35. Ionic compounds are electrically charged. (4.1) K/U
36. Most ionic compounds are crystalline solids at room
temperature. (4.1) K/U
37. Three-dimensional structure describes the threedimensional arrangement of atoms in a pure
substance. (4.2) K/U
38. Carbon dioxide molecules have a bent shape. (4.2) K/U
39. In a polar covalent bond, electrons are shared equally
between atoms. (4.3) K/U
40. Electronegativity is the ability of an atom in a
molecule to attract electrons to itself. (4.3) K/U
41. A molecule is polar if it contains at least one polar
bond and is not symmetrical about the central atom. (4.5) K/U
42. Hybridization is based on the concept that all
hybridized orbitals are identical. (4.6) K/U
43. Semiconductors are doped with atoms that have
the same number of valence electrons as the
semiconductor atoms. (4.8) K/U
Unit 2 Self-Quiz 271
5/3/12 11:18 AM