The document contains 69 multiple choice questions about concepts in chemistry including: 1) Scientists who made important discoveries about the structure of atoms such as Thomson, Millikan, Rutherford. 2) Properties of atoms such as mass number, atomic number, isotopes. 3) Ions and their charges. 4) Naming compounds from their formulas and vice versa. 5) Bonding types and common elements and compounds. The questions assess a wide range of foundational chemistry concepts in a multiple choice format.

1. Questions on
Chapter 2
(Choose and mark the correct answer)
1- The scientist who determined the magnitude of the electric charge of the electron was
a- John Dalton. b- Robert Millikan. c- J. J. Thomson. d- R. Chang.
2- The scientist who determined the ratio of electric charge to the mass of an individual
electron was
a- John Dalton. b- Robert Millikan c- J. J. Thomson. d- R. Chang.
3- When J. J. Thomson discovered the electron, what physical property of the electron did
he measure?
a- its charge, e b- its charge-to-mass ratio, e/m
c- its mass, m d- its atomic number, Z
4- The scientist who developed the nuclear model of the atom was
a- James Chadwick. b- Robert Millikan. c- J. J. Thomson. d- Ernest Rutherford
5- The scientist who discovered the neutron was
a- James Chadwick. b- Robert Millikan. c- J. J. Thomson. d- Ernest Rutherford
6- Rutherford's experiment with alpha particle scattering by gold foil established that
a- protons are not evenly distributed throughout an atom.
b- electrons have a negative charge.
c- atoms are made of protons, neutrons, and electrons.
d- protons are 1840 times heavier than electrons.
7- How many protons and electrons are present in one Br- ion?
a- 35 p, 35 e b- 80 p, 81 e c- 35 p, 34 e d- 35 p, 36 e
8- How many neutrons are there in an atom of lead whose mass number is 208?
a- 82 b- 126 c- 208 d- none of them
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2. 9- An atom of the isotope sulfur-31 consists of how many protons, neutrons, and
electrons? (p = proton, n = neutron, e = electron)
a- 15 p, 16 n, 15 e b- 16 p, 15 n, 16 e c- 16 p, 31 n, 16 e d-16 p, 16 n, 15 e
10- Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-
37
a- 37 p, 37 e, 17 n b- 17 p, 17 e, 37 n c- 17 p, 17 e, 20 n d- 37 p, 17 e, 20 n
11- A magnesium ion, Mg2+, has
a- 12 p and 13 e b- 24 p and 26 e c- 12 p and 10 e d- 12 p and 14 e
12- An aluminum ion, Al3+, has:
a- 13 p and 13 e b- 13 p and 27 e c- 10 p and 13 e d- 13 p and 10 e
13- An oxide ion, O2-, has:
a- 8 p and 10 e b- 10 p and 8 e c- 8 p and 9 e d- 8 p and 6 e
14- A sulfide ion, S2- , has:
a- 16 p and 16 e b- 32 p and 16 e c- 16 p and 14 e d- 16 p and 18 e
15- What is the number of protons (p) and electrons (e-) in Na+?
a- 11 p, 10 e- b- 8 (p), 10 e- c- 12 (p), 10 e- d- 9 (p), 10 e-
16- The number of neutrons (n) and protons (p) in the element zinc ( 30 Zn 2+ ) is:
65
a- 30 n, 28 p b- 35 n, 30 p c- 31 n, 30 p d- 35 n, 28 p
17- The number of protons (p) and electrons (e) in the element zinc ( 30 Zn 2+ ) is:
65
a- 30 p, 28 e b- 35 n, 30 p c- 31 n, 30 p d- 35 n, 28 p
18- What is the appropriate symbol for the isotope Z = 11, A = 23?
34 23 23 23
a- 23 V b- 12 Mg c- 11 Na d- 11 V
19- What is the appropriate symbol for the isotope Z = 28, A = 64?
28 64 64 64
a- 64 Ni b- 28 Kr c- 28 Gd d- 28 Ni
20- The appropriate symbol for the isotope with number of electrons = 11 and number of
neutrons = 12
59
a- 51 V
23 b- 24 Mg
12 c- 27 Co d- 23 Na
11
2

3. 21- Use the following table and choose which of the species are neutral?
atom or ion of element A B C D E F G
Number of electrons (e-) 5 10 18 28 36 5 9
Number of protons (p) 5 7 19 30 35 5 9
Number of neutrons (n) 5 7 20 36 46 6 10
a- C and D b- C, D, E, F and G c- A, F and G d- B and E
22- Use the above table and choose which of the species are negatively charged?
a- C and D b- C, D, E, F and G c- A, F and G d- B and E
23- Use the above table and choose which of the species are positively charged?
a- C and D b- C, D, E, F and G c- A, F and G d- B and E
24- Use the above table and choose which of the species have larger number of neutrons
than protons?
a- C and D b- C, D, E, F and G c- A, F and G d- B and E
25- The letter A in the chemical symbol ( A X c ) represents:
Z f
a- Atomic number b- mass number c- charge d- frequency
26- The letter Z in the chemical symbol ( A X c ) represents:
Z f
a- Atomic number b- mass number c- charge d- frequency
27- The letter c in the chemical symbol ( A X c ) represents:
Z f
a- Atomic number b- mass number c- charge d- frequency
28- The letter f in the chemical symbol ( A X c ) represents:
Z f
a- Atomic number b- mass number c- charge d- frequency
204
29- Which of the following is an isotope of 82 Pb ?
197 208 212 199
a- Tl
81 b- 80 Hg c- 82 Pb d- Tl
81
30- Atoms of the same element with different mass numbers are called
a- ions. b- neutrons. c- isotopes. d-chemical families.
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4. 31- Atoms which have the same number of electrons and number of protons are called
a- ions. b- neutral atoms c- isotopes. d- different atoms.
32- Atoms which have different number of electrons than number of protons are called
a- ions. b- neutral atoms c- isotopes. d- different atoms
33- Atoms which have different number of protons are called
a- ions. b- neutral atoms c- isotopes. d- different atoms.
34- Atoms with the same number of protons and with different number of neutrons are
called
a- ions. b- neutral atoms c- isotopes. d- different atoms.
35- Two isotopes of an element differ only in their
a- symbol. b- atomic number. c- atomic mass. d- number of protons.
107 109
36- Silver occurs in nature as a mixture of two isotopes: 47 Ag and 47 Ag . The number of
protons in both isotopes ( 107 Ag and
47
109
47 Ag ) is:
107
a- the same b- bigger in isotope 47 Ag
107
c- smaller in isotope 47 Ag d- none of the above
107 109
37- Silver occurs in nature as a mixture of two isotopes: 47 Ag and 47 Ag . The number of
electrons in both isotopes ( 107 Ag and
47
109
47 Ag ) is:
107
a- the same b- bigger in isotope 47 Ag
107
c- smaller in isotope 47 Ag d- none of the above
107 109
38- Silver occurs in nature as a mixture of two isotopes: 47 Ag and 47 Ag . The number of
neutrons in both isotopes ( 107 Ag and
47
109
47 Ag ) is:
107
a- the same b- bigger in isotope 47 Ag
107
c- smaller in isotope 47 Ag d- none of the above
107 109
39- Silver occurs in nature as a mixture of two isotopes: 47 Ag and 47 Ag . The mass number
in both isotopes ( 107 Ag and
47
109
47 Ag ) is:
107
a- the same b- bigger in isotope 47 Ag
107
c- smaller in isotope 47 Ag d- none of the above
4

5. 40- In which one of the following pairs do the two species resemble each other most closely
in chemical properties?
+
1 1
a- 1 H and 1 H b-
14
7 N and 14
7 N 3− 12 13
c- 6 C and 6 C
23
d- 11 Na and
23
11 Na +
41- An anion is defined as
a- a charged atom or group of atoms with a net negative charge.
b- a stable atom.
c- a group of stable atoms.
d- an atom or group of atoms with a net positive charge.
42- Which one of these species is an ion?
a- B3+ b- NaCl c- He d- 14
C
43- The elements in a column of the periodic table are known as
a- metalloids. b- a period. c- a group. d- noble gases.
44- Which of these materials are usually poor conductors of heat and electricity?
a- metalloids. b- metals c- nonmetals d- alkali metals
45- Which of these elements is most likely to be a good conductor of electricity?
a- N b- S c- He d- Fe
46- Which of these elements is chemically similar to magnesium?
a- sulfur b- calcium c- iron d- nickel
47- Which of these elements is chemically similar to oxygen?
a- sulfur b- calcium c- iron d- nickel
48- Which pair of compounds has the same empirical formula?
a- C2H6O3 and CH2O b- NO2 and N2O4 c- C6H6and CH4 d- NO2 and NO4
49- What is the empirical formula of C6H6?
a- C6O b- CH6 c- C3H3 d- CH
50- What is the empirical formula of P4O10?
a- P4O5 b- P2O5 c- PO d- PO5
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6. 51- What is the empirical formula of N2O5?
a- N2O5 b- NO c- NO5 d- N2O
52- Which of these pairs of elements would be most likely to form an ionic compound?
a- P and Br b- Cu and K c- C and O d- O and Zn
53- Which pair of elements would be most likely to form an ionic compound?
a- P and Br b- Zn and K c- F and Al d- C and S
54- What is the formula for the ionic compound formed by calcium ions and nitrate ions?
a- Ca3N2 b- Ca(NO3)2 c- Ca2NO3 d- Ca2NO2
55- What is the formula for the ionic compound formed by magnesium and iodine?
a- MgI b- Mg2I c- MgI2 d- MgI3
56- Which is the correct formula for copper(II) phosphate?
a- Cu2PO4 b- Cu3(PO4)2 c- Cu2PO3 d- Cu(PO4)2
57- The formula for magnesium sulfate is
a- MnS b- MgS c- MgSO4 d- MnSO3
58- The formula for sodium sulfide is
a- NaS b- NaS2 c- K2S d- Na2S
59- The correct name for NO2 is
a- nitrogen dioxide b- dinitrogen oxide
c- nitrogen oxide d- dinitrogen monoxide
60- The correct name for N2O is
a- nitrogen dioxide b- dinitrogen oxide
c- nitrogen oxide d- dinitrogen monoxide
61- The correct name for SO2 is
a- sulfur oxide b- sulfur dioxide
c- sulfur trioxide d- monosulfur dioxide
62- The correct name for N2O3 is
a- nitrogen trioxide b- dinitrogen trioxide
c- nitrogen oxide d- dinitrogen oxide
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7. 63- The correct name for Al2O3 is
a- aluminum trioxide b- dialuminum trioxide
c- aluminum oxide d- dialuminum oxide
64- The correct name for K2O is
a- potassium dioxide b- dipotassium oxide
c- potassium oxide d- dipotassium monoxide
65- The correct name for PCl3 is
a- phosphorus chloride b- monophosphorus chloride
c- phosphorus trichloride d- monophosphorus trichloride
66- The correct name for AlCl3 is
a- aluminum chloride b- monoaluminum chloride
c- aluminum trichloride d- monoaluminum trichloride
67- The correct names for H2S and H2O are
a- dihydrogen sulfide and dihydrogen oxide b- hydrogen sulfide and water
c- hydrogen sulfide and hydrogen oxide d- dihydrogen sulfide and water
68- The correct names for PH3 and NH3 are
a-monophosphorous trihydride and mononitrogen trihydride
b- monophosphorous trihydride and ammonia
c- phosphorous trihydride and ammonia
d- phosphorous trihydride and nitrogen trihydride
69- The correct name for NH4NO3 is
a- ammonium nitrate b- ammonium nitrogen trioxide
c- ammonia nitrogen oxide d- hydrogen nitrate
70- The correct name for Ba(OH)2 is
a- barium hydroxide b- boron hydroxide
c- barium hydrogen oxide d- barium hydrate
71- The Stock system name for Mn2O7 is
a- manganese(II) oxide b- manganese(III) oxide
c- manganese(VII) oxide d- magnesium oxide
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8. 72- Which is the correct formula for lead(IV) chloride?
a- Pb4Cl b- PbCl2 c- PbCl3 d- PbCl4
73- The chemical formula for iron(II) nitrate is
a- Fe2(NO3)3 b- Ir(NO2)2 c- Fe2N3 d- Fe(NO3)2
74- The Stock system name for CrSO3 is
a- chromium sulfide b- chromium(II) sulfate
c- chromium(II) sulfite d- chromium(III) sulfite
75- The Stock system name for CrO3 is
a- chromium oxide b- chromium(II) oxide
c- chromium(III) trioxide d- chromium(VI) oxide
76- The Stock system name for Cr2O3 is
a- chromium(III) oxide b- dichromium trioxide
c- chromium(III) trioxide d- chromium(VI) oxide
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