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A nucleus of stable phosphorus has 15 pr...

A nucleus of stable phosphorus has 15 protons and 16 neutrons.
(a) What is its atomic number and mass number ?
(b) The nucleus of radio phosphorus has one neutron more than the stable nucleus. What will be its atomic and mass number ?
(c ) What will be the atomic number and mass number of new nucleus formed by the decay of a `beta`-particle by the radio phosporus in part (b) ?

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The correct Answer is:
(a) atomic number = 15, mass number = 31
(b) atomic number = 15, mass number = 32
(c ) atomic number = 16, mass number = 32
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ICSE-RADIOACTIVITY-EXERCISE-12(A)
  1. State whether the following nuclear disintegrations are allowed or not...

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

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

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

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

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

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

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  8. Name one radio isotope and state its use.

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

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

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

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

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  13. State the medical use of radioactivity.

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

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

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

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

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

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

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  20. What do you mean by background radiations ? Name its two sources. Is i...

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