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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) 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
4) 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
2
5) 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: E
Learning Outcome: 2.1
Bloom’s Taxonomy: Knowledge
6) 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: Knowledge
7) Which element commonly has only a proton as its nucleus?
A) helium
B) neon
C) argon
D) hydrogen
E) none of the above
Answer: D
Learning Outcome: 2.1
Bloom’s Taxonomy: Knowledge
8) 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: Knowledge
3
9) 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
10) 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: Knowledge
11) Which of the following lists contain 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 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:
