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Observe the following statements regardi...

Observe the following statements regarding isotones `:`
`a.` `.^(39)K` and `.^(40)Ca` are isotones.
`b.` Nucleides having different atomic number `(Z)` and mass numbers `(a)` but same number of neutrons `(n)` are called isotones.
`c.` `.^(19)F` and `.^(23)Na` are isotones.
The correct answer is `-`

A

i,ii and iii are correct

B

Only (i) and (ii) are correct

C

Only i and iii are correct

D

Only ii and iii are correct

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The correct Answer is:
B
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AAKASH SERIES-NUCLEI-Exercise-I
  1. The graph of on (R//R(0)) versus ln A (R=radius of nuccleus and A= its...

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  2. The mass density of a nucleus varies with mass number A as:

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  3. Observe the following statements regarding isotones : a. .^(39)K and...

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  4. The ratio of the volume fo the atom to the volume of the nucleus is of...

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  5. Which of the forces are considered as shortest ranged ?

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  6. The origin of nuclear force between nucleons is due to the exchange of

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  7. Nuclear forces are

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  8. If the nuclear force between two protons, two neutrons and between pro...

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  9. One requires energy En to remove a nucleon from a nucleus and an energ...

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  10. Two nucleons are at a separation of 1xx10^(-15)m. The net force betwee...

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  11. The binding energy per nucleon is maximum at A=56 and its value is aro...

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  12. As the mass number A increases, the binding energy per nucleon in a nu...

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  13. The stability of a nucleus can be measured by

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  14. In nuclear reaction .2He^4 + .ZX^A to .(Z+2)Y^(A+3)+R,R denotes

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  15. The penetrating powers of alpha and beta and gamma radiations, in decr...

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  16. When alpha, beta and gamma radiation pass through a gas, their ionizin...

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  17. The half-life period of a radioactive element x is same as the mean li...

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  18. A fraction f1 of a radioactive sample decays in one mean life, and a f...

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  19. The half life period of a radioactive sample depends upon

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  20. Half life period of lead is

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