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When an alpha particle emitted from an u...

When an alpha particle emitted from an unstable nucleus, the mass number of the nucleus

A

increases by 2

B

increases by 4

C

decreases by 4

D

decreases by 2

Text Solution

Verified by Experts

The correct Answer is:
C
`""_(Z)^(A)Xto""_(Z-2)^(A-4)Y+""_(2)^(4)alpha`
`alpha`-particle causes loss of 2P and 2n.
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CENGAGE CHEMISTRY-RADIOACTIVITY-MANDATORY EXERCISE (SET I)
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  2. The elements which emit radioactivity are known as

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  3. The type of radiations emitted by radioactive substance are

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  4. The radiations emitted by different elements are

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  5. The spontaneous emission of radioactivity by unstable nuclei is called

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  6. In case of radioactive nucleus

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  7. Number of neutrons in element plutonium is ""(94)^(242)Pu

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  8. Which action will most increase a present exposure to radioactivity?

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  9. Which of the following have highest penetrating capacity

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  10. An atom of radium combines with two atoms of chlorine to form RaCl(2) ...

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  11. ""(6)^(11)C on decay produces

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  12. Isodiaphers are atoms having

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  13. A particle of mass m when annihilated completely gives energy E equal ...

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  14. ""^(23)Na is more stable isotope of Na. Find out the process by which ...

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  15. Which of the following isotopes is likely to be most stable

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  16. Neutrino was predicted to

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  17. Number of neutrons in a parent nucleus x, which gives ""(7)^(14)N afte...

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  18. Which of the following projectiles is the best for bombarding the nucl...

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  19. An alpha particle is also known as

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  20. When an alpha particle emitted from an unstable nucleus, the mass numb...

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