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An atomic nucleus A is composed of 84 pr...

An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus A emits and alpha particle and is transformed into a nucleus B.
(i) What is the composition of B ?
(ii) The nucleus B emits a beta particle and is transformed into a nucleus C. What is the composition of C?
(iii) What is mass number of the nucleus A ?
(iv) Does the composition of C change if it emits gamma radiations ?

Text Solution

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The correct Answer is:
(a) 82 protons and 126 neutrons
(b) 83 protons and 125 neutrons ( c) 212 (d) no
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ICSE-RADIOACTIVITY-EXERCISE-12(A)
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  2. What changes occur in the nucleus of a radioactive element when it emi...

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  3. An atomic nucleus A is composed of 84 protons and 128 neutrons. The nu...

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  4. A certain nucleus A ( mass number 238 and atomic number 92 ) is radioa...

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

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

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

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

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

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

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

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  12. Name one radio isotope and state its use.

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

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

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

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

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  17. State the medical use of radioactivity.

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

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

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

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