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The numbers 2,8,20,28,50,82,126 are call...

The numbers 2,8,20,28,50,82,126 are called as

A

even Numbers

B

integers

C

bohr Numbers

D

magic Number

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The correct Answer is:
D
Magic numbers.
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Nuclei with magic no. of proton Z=2,8,20,28,50,52 and magic no. of neutrons N=2,8,20,28,50,82 and 126 are found to be stable. (i) Verify this by calculating the proton separation energy S_(p) for .^(120)Sn (Z=50) and .^(121)Sb =(Z=51) . The proton separation energy for a nuclide is the minimum energy required to separated the least tightly bound proton form a nucleus of that nuclide. It is given by S_(p)=(M_(z-1,N)+M_(H)-M_(Z,N))c^(2) . given .^(119)Sn =118.9058u, .^(120) Sn =119.902199u, .^(121)Sb=120.903824u, .^(1)H=1.0078252u (ii) what does the existence of magic number indicate?

It has been found that nuclides with 2,8,20,50,82, and 126 protons or neutrons are exceptionally stable. These numbers are refferd to as the magic numbers and their existance has led to.

If the mean of numbers 27, 31, 89, 107, 156, is 82, then the mean of 130, 126, 68, 50, 1 is

The wrong number in the series 2,9,28,65,126,216,344 is

The median of the scores 25,28,20,8,10,15i

find the missing number in the series 2, 10, 26, 50, 82, ….

If the mean of the numbers 27+x,31+x,89+x,107+x,156+x is 82, then the mean of 130+x,126+x,68+x,50+x,1+x is

2, 7, 28, 63, 126, ….

2,9, 28, ? 126, 217, 344

DINESH PUBLICATION-NUCLEAR AND RADIO CHEMISTRY-Brain Teasers-7
  1. The buring of hydrogen is called as

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  2. The elements with even atomic numbers are

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  3. The numbers 2,8,20,28,50,82,126 are called as

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  4. How may alpha- and beta- particles will be emitted when .(90)Th^(232) ...

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  5. Successive emission of an alpha-particle and two beta-particles by an ...

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  6. The largest stable nucleus is

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  7. When a radioactive substances is subjected to a vacuum, the rate of di...

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  8. The radioactivity due to C-14 isotope (half-life = 6000 years) of a sa...

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  9. Tritium undergose radioactive decay giving

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  10. How many hour are required for a current of 3.0 ampere to decompose 18...

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  11. The nuclear reaction given below is of …… type ""(13)^(27)Al + ""(2)...

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  12. A sample of radioactive element with t(0.5) of 11.2yr weigh 2.0 g . Af...

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  13. The t(0.5) of a radioactive element is related to its average life by ...

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  14. Which one is an example of miceller system?

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  15. Which of the following is the best protective colloid?

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  16. The coagulation of 100ml of colloidal solution of gold is completely p...

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  17. A isoelectric point

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  18. Gold number was given by :

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  19. The accumulation of gases on surface of solids is called as

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  20. In the Leclanche dry cell, anode is

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