Q1: What is radioactivity?
A: The phenomenon of spontaneous emission of alpha particle or beta particle and gamma rays from an unstable nucleus is called radioactivity.
Q2: When does a nucleus become unstable ?
A: When the number of neutrons become much more than that of protons.
Q3: Which part of the atom takes part in radioactivity ?
A: Nucleus
Q4: What happens to the radioactive behaviour of a radioactive sample if it is chemically oxidized ?
A: The radioactive behaviour does not change. As oxidation is the chemical change, it does not affect the nuclear activity.
Q5: How does the atomic number and mass number change if a radioactive nucleus releases one alpha particle ?
A: Atomic number decreases by 2 and mass number decreases by 4
Q6: How does the atomic number and mass number change if a radioactive nucleus releases one beta particle?
A: Atomic number increases by 1 and mass number does not change.
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