1. The atomic number of natural radioactive element is __________. [April 2013]
2. When a radioactive nucleus disintegrates by emitting beta particle, its atomic number __________. [March 2010]
3. Match the following: [September 2015]
Column A | Column B |
| (a) Henri Becqurel | |
| (b) Otto Hahn |
4. Gamma rays are harmful radiations emitted by natural radioactive substances.
(a) Which are the other radiations emitted by natural radioactive substances?
(b) What is the unit of nuclear radiation? [September 2015] and [March 2014]
(a) The other radiations emitted by natural radioactive substances are .
(b) The unit of nuclear radiation is .
5. In the nuclear reaction given below, a nucleus \(X\) changes into another nucleus \(Y\).
\(_{88}X^{226}\) \(\rightarrow\) \(Y\) \(+\) \(_{2}He^{4}\)
What is the atomic number and mass number of \(Y\)? [March 2014]
Atomic number of \(Y\) is .
Mass number of \(Y\) is .