A. α-particle emission from a radioactive element makes it electrically negative
B. β-particle emission from a radioactive element makes it electrically positive
C. A radioactive element having a half life period of 20 years will completely disintegrated in 40 years
D. The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration
Correct Answer: A radioactive element having a half life period of 20 years will completely disintegrated in 40 years ✔
Last Updated: March 07, 2019