1.

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A. Positron is heavier than a proton
B. A, β-ray particle is identical with an electron
C. The nucleus of a hydrogen atom is identical with a proton
D. Mass of an electron is about 1/1800th of the lightest nucleus
Answer» B. A, ‚âà√≠‚Äö√¢¬ß-ray particle is identical with an electron


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