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A nucleus ""(11)^(24) Na is beta-radioa...

A nucleus ` ""_(11)^(24) Na` is `beta`-radioactive.
(a) What are the numbers 24 and 11 called ?
(b) Write the equation representing `beta`-decay.
(c ) What general name is given to the product nucleus with respect to ` ""_(11)^(24) Na` ?

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The correct Answer is:
(a) 24 - mass number, 11 - atomic number
(b) ` ""_(11)^(24) Na to _(12)^(24) Mg + _(-1)^(0) e` (c ) isobar
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ICSE-RADIOACTIVITY-EXERCISE-12(A)
  1. A certain nucleus A ( mass number 238 and atomic number 92 ) is radioa...

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  2. State whether the following nuclear disintegrations are allowed or not...

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  3. A nucleus ""(11)^(24) Na is beta-radioactive. (a) What are the numb...

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  4. A nucleus of stable phosphorus has 15 protons and 16 neutrons. (a) W...

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  5. An element P disintegrates by alpha emission and the new element suffe...

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  6. A nucleus ""(Z)^(A) X emits 2 alpha particles and 1 beta particle to ...

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  7. Complete the following sentences : (a) The mass number and atomic nu...

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  8. Complete the following nuclear changes : (a) ""(x)^(a) P to Q +(-1)^...

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  9. Name one radio isotope and state its use.

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  10. Why are the alpha particles not used in radio therapy ? [Hint : alph...

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  11. Why do we usually use isotopes emitting gamma radiations as radioactiv...

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  12. When does the nucleus of an atom tend to be radioactive ?

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  13. Which of the following is the radio isotope in each pair (a) (b) and...

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  14. State the medical use of radioactivity.

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  15. Arrange the alpha, beta and gamma radiation in ascending order of thei...

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  16. Name two main sources of nuclear radiations. How are the nuclear radia...

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  17. State two safety measures to be taken while establishing a nuclear pow...

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  18. What is meant by nuclear waste ? State one way for the safe disposal o...

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  19. State three safety precautions that you would take while handling the ...

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  20. Why should a radioactive substance not be touched by hand ?

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