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Inquiry into Life, 15e (Mader)
Chapter 2 The Molecules of Cells
1) If an element has an atomic number of 12, how many electrons are in its outermost shell?
A) 1
B) 10
C) 8
D) 2
E) 12
Answer: D
Explanation: Two electrons fill the innermost shell and eight fill the next, leaving two for the
outermost shell.
Section: 02.01
Topic: Atomic Structure
Bloom’s: 3. Apply
Learning Outcome: 02.01.01 Describe how protons, neutrons, and electrons relate to atomic
structure.
Accessibility: Keyboard Navigation
2) If an element has an atomic number of 15, then
A) the atomic mass must also be 15.
B) the atom has 15 electrons.
C) there are 7 electrons in the outermost shell.
D) the atom has 15 neutrons.
E) the atom must have only one orbital.
Answer: B
Explanation: In an electrically neutral atom, the number of protons (the atomic number) is the
same as the number of electrons. The atom would need three orbitals to accommodate 15 electrons,
and there would be 5 electrons in its outermost shell. The atomic mass includes the protons and the
neutrons; the number of neutrons is not specified in this question.
Section: 02.01
Topic: Atomic Structure
Bloom’s: 3. Apply
Learning Outcome: 02.01.02 Understand how to interpret the periodic table of elements.
Accessibility: Keyboard Navigation

INQUIRY INTO LIFE RELEVANCY UPDATE 15.1 15TH EDITION MADER TEST BANK

2
Copyright © 2019 McGraw-Hill
3) The chemical reactivity of an element is dependent on
A) the number of protons.
B) the arrangement of neutrons.
C) the number of electrons in the outermost shell.
D) the number of protons and neutrons.
E) the number of electrons in the inner shell.
Answer: C
Explanation: It is the outermost shell of an atom that can potentially react with electrons in the
outermost shells of other atoms. The protons and neutrons remain in the nucleus and do not engage
in chemical reactions.
Section: 02.01
Topic: Chemical Reactions
Bloom’s: 1. Remember
Learning Outcome: 02.01.03 Describe how variations in an atomic nucleus account for its
physical properties.
Accessibility: Keyboard Navigation
4) The atomic mass of an element
A) is determined by the number of protons and neutrons it contains.
B) equals the number of protons plus the number of electrons.
C) equals the number of neutrons.
D) changes after each reaction.
E) depends on the number of electrons in the outermost shell.
Answer: A
Explanation: The atomic mass is essentially the sum of protons and neutrons in the nucleus; it is
not changed by chemical reactions. The mass of electrons is negligible.
Section: 02.01
Topic: Atomic Structure
Bloom’s: 1. Remember
Learning Outcome: 02.01.02 Understand how to interpret the periodic table of elements.
Accessibility: Keyboard Navigation