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State the atomic number and mass number ...

State the atomic number and mass number of ` ""_(11)^(23) Na` and draw its atomic model.

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ICSE-RADIOACTIVITY-EXERCISE-12(A)
  1. Define the following terms : (a) atomic number, and (b) mass number.

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  2. What is nucleus of an atom ? Compare its size with that of the atom. N...

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  3. State the atomic number and mass number of ""(11)^(23) Na and draw it...

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  4. What are isotopes ? Give one example.

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  5. (i) What are isobars? (ii) Give one example of isobars.

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  6. What is the name given to elements with same mass number and different...

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  7. Name the atoms of a substance having same atomic number, but different...

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  8. What is meant by Radioactivity ?

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  9. A radioactive substance is oxidised. What changes would you expect to ...

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  10. A radioactive source emits three type of radiations. (a) Name the th...

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  11. Answer the following questions. (a) Name the radiation of zero mass....

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  12. The diagram in Fig. shows a radioactive source S placed in a thick lea...

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  13. Fig. 12.8 shows a mixed source R of alpha and beta particles in a thic...

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  14. Explain why alpha and beta particles are deflected in an electric or a...

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  15. Explain why alpha and beta particles are deflected in an electric or a...

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  16. State following four properties each of alpha, beta and gamma radiatio...

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  17. Compare the ionising power of alpha, beta and gamma radiations.

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  18. State the speed of each of alpha, beta and gamma radiations.

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  19. (a) What is the composition of alpha, beta and gamma radiations? (b) C...

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  20. How are gamma radiations produced ? Mention two common properties of t...

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