How does an atom become a positive or a negative ion?
a. An atom becomes a positive ion by gaining a proton; it becomes a negative ion by losing a proton.
b. An atom becomes a positive ion by gaining a proton; it becomes a negative ion by gaining an electron.
c. An atom becomes a positive ion by losing an election; it becomes a negative ion by gaining an electron.
d. An atom becomes a positive ion by losing a neutron; it becomes a negative ion by gaining an electron.
e. An atom becomes a positive ion by gaining an electron; it becomes a negative ion by losing an electron.
c. An atom becomes a positive ion by losing an election; it becomes a negative ion by gaining an electron.
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Carbon dioxide is ________.
A. the most potent (per molecule of gas) of the greenhouse gases B. the most abundant greenhouse gas C. more potent (per molecule of gas) than methane D. the main anthropogenic greenhouse gas produced in the United States E. the only greenhouse gas presently increasing in the atmosphere
In a systems model, movement of energy or matter into the system is a(n):
a. subsystem. b. output. c. input. d. closed system.
Atoms with different numbers of neutrons in their nucleus are
A. ions. B. electrons. C. isotopes.
Which region in the continental U.S. has the highest hazard associated with volcanoes and why?
A. Southern California because of the convergent plate boundary there. B. The Pacific northwest because of the convergent plate boundary there. C. The Pacific northwest because of the transform plate boundary there. D. Southern California because of the transform plate boundary there.