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Pick out the wrong statement. | |
A. | The ratio of the density of the 'nucleus' to that of the 'atom' is 1012 . [Wrong Answer] |
B. | α-particle is identical with a doubly charged helium ion. [Wrong Answer] |
C. | The mass of deuterium atom is half that of helium atom. [Wrong Answer] |
D. | Gamma rays are high energy electrons. [Correct Answer] |