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Essentials of The Living World, 6e (Johnson)
Chapter 2 The Chemistry of Life
1) The nucleus of an atom is composed of
A) protons and neutrons.
B) protons and electrons.
C) only electrons.
D) only protons.
E) only neutrons.
Answer: A
Explanation: Electrons are found outside of the nucleus. Protons and neutrons are found in the
nucleus. Please see section 2.1.
Section: 02.01
Topic: Atomic Structure
Bloom’s: 1. Remember
Learning Outcome: 02.01.01 Describe the basic structure of an atom in terms of three subatomic
particles.
Accessibility: Keyboard Navigation
2) Atoms that have a positive or negative charge are known as
A) magnetic.
B) electrically neutral.
C) ions.
D) protons.
E) stable.
Answer: C
Explanation: Ions have gained or lost electrons. Please see section 2.2.
Section: 02.02
Topic: Atomic Structure; Chemical Bonds
Bloom’s: 1. Remember
Learning Outcome: 02.02.01 Differentiate between a cation and an anion.
Accessibility: Keyboard Navigation

ESSENTIALS OF THE LIVING WORLD 6TH EDITION JOHNSON TEST BANK

2
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written consent of McGraw-Hill Education.
3) The chemical behavior of an atom is determined by its
A) protons.
B) neutrons.
C) nuclei.
D) electrons.
E) mass.
Answer: D
Explanation: Electrons govern interactions since they are the atomic particles which form the
bonds. Please see section 2.1.
Section: 02.01
Topic: Atomic Structure
Bloom’s: 1. Remember
Learning Outcome: 02.01.02 Explain why electrons determine the chemical behavior of atoms.
Accessibility: Keyboard Navigation
4) In a neutral atom, the number of protons is always
A) equal to the electrons.
B) more than the electrons.
C) more than the neutrons.
D) less than the neutrons.
E) less than the electrons.
Answer: A
Explanation: Electrical neutrality means that there must be equal numbers of electrons and
protons. Please see section 2.1.
Section: 02.01
Topic: Atomic Structure
Bloom’s: 2. Understand
Learning Outcome: 02.01.01 Describe the basic structure of an atom in terms of three subatomic
particles.
Accessibility: Keyboard Navigation