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Multiple Choice Questions: Section One
1) The smallest stable units of matter are
A) atoms.
B) molecules.
C) protons.
D) neutrons.
E) electrons.
Answer: A
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
2) The “atomic number” of an atom is determined by the number of ________ it has.
A) electrons
B) protons
C) neutrons
D) protons + neutrons
E) protons + electrons
Answer: B
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
3) The “atomic weight” of an atom reflects the average number of
A) protons.
B) neutrons.
C) electrons.
D) protons + neutrons.
E) protons + neutrons + electrons.
Answer: D
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
4) One mole of any element has the same
A) mass.
B) weight.
C) number of atoms.
D) number of electrons.
E) All of the answers are correct.
Answer: C
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
2
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5) The nucleus of an atom consists of
A) electrons.
B) protons.
C) neutrons.
D) protons + neutrons.
E) protons + electrons.
Answer: D
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
6) Isotopes of an element differ in the number of
A) protons in the nucleus.
B) electrons in the nucleus.
C) neutrons in the nucleus.
D) electron clouds.
E) electrons in energy shells.
Answer: C
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
7) The mass number represents the number of
A) protons in an atom.
B) electrons in an ion.
C) neutrons in an atom.
D) protons + neutrons.
E) neutrons + electrons.
Answer: D
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
8) The innermost electron shell in an atom holds up to ________ electrons.
A) 1
B) 2
C) 4
D) 6
E) 8
Answer: B
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
3
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9) Radioisotopes have unstable
A) ions.
B) nuclei.
C) isotopes.
D) electron clouds.
E) protons.
Answer: B
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
10) By weight, which element is the most plentiful in the human body?
A) sulfur
B) sodium
C) oxygen
D) potassium
E) carbon
Answer: C
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
11) Which of these lists contains only trace elements?
A) sulfur, chlorine, oxygen
B) selenium, hydrogen, calcium
C) boron, oxygen, carbon
D) silicon, fluorine, tin
E) cobalt, calcium, sodium
Answer: D
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
12) The atomic number represents the number of
A) electrons in an atom.
B) protons in an atom.
C) neutrons in an atom.
D) protons and neutrons in an atom.
E) chemical bonds the atom may form.
Answer: B
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
4
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13) Helium (He) has an atomic number of 2. It is chemically stable because it
A) is neutral in electrical charge.
B) readily ionizes to react with other atoms.
C) has a full outer electron shell.
D) will form a covalent bond with another He atom.
E) lacks electrons, thus the He atom is stable.
Answer: C
Learning Outcome: 2-1
Bloom’s Taxonomy: Comprehension
14) Which element commonly has only a proton as its nucleus?
A) helium
B) neon
C) argon
D) hydrogen
E) carbon
Answer: D
Learning Outcome: 2-1
Bloom’s Taxonomy: Comprehension
15) By weight, which element is the second most abundant in the human body?
A) oxygen
B) carbon
C) hydrogen
D) nitrogen
E) calcium
Answer: B
Learning Outcome: 2-1
Bloom’s Taxonomy: Comprehension
16) In any given molecule, the sum of the atomic weights of its component atoms is called
A) molecular mass.
B) molecular weight.
C) atomic mass.
D) atomic weight.
E) chemical mass.
Answer: B
Learning Outcome: 2-1
Bloom’s Taxonomy: Knowledge
5
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17) Given the following approximate values, calculate the molecular weight for NaCl.
Atomic number for Na: 11, Atomic weight for Na: 23 g/mol, Atomic number for Cl: 17,
Atomic weight for Cl: 35 g/mol, Boiling point for Cl: -34 °C
A) 11 g/mol
B) 28 g/mol
C) 34 g/mol
D) 40 g/mol
E) 58 g/mol
Answer: E
Learning Outcome: 2-1
Bloom’s Taxonomy: Application
18) The mass of an atom is largely determined by the number of ________ it has.
A) electrons
B) protons
C) neutrons
D) protons + neutrons
E) protons + electrons
Answer: D
Learning Outcome: 2-1
Bloom’s Taxonomy: Comprehension
19) If an isotope of oxygen has 8 protons, 10 neutrons, and 8 electrons, its mass number is
A) 26.
B) 16.
C) 18.
D) 8.
E) 12.
Answer: C
Learning Outcome: 2-1
Bloom’s Taxonomy: Application
20) If an element is composed of atoms with an atomic number of 6 and a mass number of 14,
then a non-isotopic atom of this element contains
A) 6 protons.
B) 8 electrons.
C) 8 neutrons.
D) 6 protons and 8 electrons.
E) 6 protons and 8 neurons.
Answer: E
Learning Outcome: 2-1
Bloom’s Taxonomy: Application
6
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