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Pick out the wrong statement. | |
A. | α-particle emission from a radioactive element makes it electrically negative. [Wrong Answer] |
B. | β-particle emission from a radioactive element makes it electrically positive. [Wrong Answer] |
C. | A radioactive element having a half life period of 20 years will completely disintegrated in 40 years. [Correct Answer] |
D. | The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration. [Wrong Answer] |