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(1-1) © Philip Ball.
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(2-1) Metropolitan Museum of Art, New york.
Photo © Bettman/corbis.
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(3-1) From Georguis Agricola, De re
metallica, 1556.
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(3-2) From Georguis Agricola, De re
metallica, 1556.
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(4-1) Science Photo Library.
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(4-2) © Matthew L. Aron, University of Chicago/International
Atomic Energy Authority.
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(4-4) © Philip Ball.
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(4-5) From ‘On the Position of Helium, Argon, and Krypton in the
Scheme of the Elements’, Proceedings of the Royal
Society, 63 (1898), 408–11.
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(5-1) © Bettman/corbis.
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(5-2) © Philip Ball.
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(5-3) © A. Zschau, GSI.
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(5-4) © Philip Ball.
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(6-1) © Bettman/corbis.
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(6-2) © Philip Ball.
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(6-3) © Robert Licho, University of Massachusetts. Medical
Hospital.
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(7-1)a © Bell Laboratories Archive.
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(7-1)b © Astrid and Hans Frieder Michler/Science Photo
Library.
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(7-2) Photo: Johnson Matthey.
