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Question
Characteristic features of naturally radioactive elements include which of the following?
I. The emission of α or β particles or γ rays.
II. A characteristic half-life.
III. Spontaneous decay.
Characteristic features of naturally radioactive elements include which of the following?
I. The emission of α or β particles or γ rays.
II. A characteristic half-life.
III. Spontaneous decay.
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Solution
The correct option is E I,II and III
General properties of Radioactive elements:- It is due to the instability of the nucleus.
- It is a spontaneous, continuous and irreversible process.
- It is independent of external factors such as pressure, temperature, state of substance, electrical field, magnetic field, catalyst etc.
- A radioactive element emits α β and γ radiations.
- Due to the emission of an α particle, atomic number decreases by 2 units and mass number decreases by 4 units.
- Due to the emission of β particle, atomic number increases by 1 unit but the mass number remains the same.
General properties of Radioactive elements:
- It is due to the instability of the nucleus.
- It is a spontaneous, continuous and irreversible process.
- It is independent of external factors such as pressure, temperature, state of substance, electrical field, magnetic field, catalyst etc.
- A radioactive element emits α β and γ radiations.
- Due to the emission of an α particle, atomic number decreases by 2 units and mass number decreases by 4 units.
- Due to the emission of β particle, atomic number increases by 1 unit but the mass number remains the same.
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