The Atomic Weight of Nickel

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IN a recent number of NATURE (February 14, p. 367) Dr. Barkla gave reasons, based on experiments in connection with secondary Röntgen radiation, for assigning to nickel a new atomic weight. Dr. Barkla studies the penetrating power of secondary Röntgen radiation, shows that it depends on the atomic weight of the element, and from the values found for nickel, in comparison with those found for copper and iron, he argues that nickel appears to have the atomic weight of 61.3 instead of the usually accepted value of 58.7.

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