Answer
H - Hydrogen atom.
Work Step by Step
Hydrogen 1 atoms are comprised of a single proton and electron, thus are the single exception to the statement that all atoms comprise protons, neutrons, and electrons.
General Chemistry: Principles and Modern Applications (10th Edition)
by Petrucci, Ralph H.; Herring, F. Geoffrey; Madura, Jeffry D.; Bissonnette, Carey
Published by
Pearson Prentice Hal
ISBN 10:
0132064529
ISBN 13:
978-0-13206-452-1
Chapter 2 - Atoms and the Atomic Theory - 2-4 Concept Assessment - Page 46: 2-4
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