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| Q. |
Which one of the following is not a radioactive element? |
| A. | Uranium |
| B. | Thorium |
| C. | Radium |
| D. | Cadmium |
| Answer» D. Cadmium | |
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Explanation: Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. Because the nucleus experiences the intense conflict between the two strongest forces in nature, it should not be surprising that there are many nuclear isotopes which are unstable and emit some kind of radiation. The most common types of radiation are called alpha, beta, and gamma radiation, but there are several other varieties of radioactivedecay. Among uranium, thorium, radium and cadmium the first three does show radioactive properties while the fourth one does not show any kind of radioactive properties. |
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