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A nuclide of an alkaine earth metal unde...

A nuclide of an alkaine earth metal undergoes radioactive deacy by emission of three `alpha-` particles in sucession. The group of the periodic tablle to which the resulting daughter element would belong to:

A

Group 14

B

Group 16

C

Group 4

D

Group 6

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The correct Answer is:
A
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Various rules of thumb have seen proposed by the scientific community to expalin the mode of radioactive decay by various radioisotopes. One of the major rules is called the n//p ratio. If all the known isotopes of the elemnts are plotted on a graph of number of neutrons (n) versus number of protons (p), it is observed that all isotopes lying outside of a ''stable'' n//p ratio region are radioactive as shown fig. The graph exhibits straight line behaviour with unit slope up to p=25 . Above p=25 , tgose isotopes with n//p ratios lying above the stable region usually undergo beta decay. Very heavy isotopes (pgt83) are unstable because of their relativley large nuclei and they undergo alpha decay. Gamma ray emission does not involve the release of a particle. It represnts a change in an atom from a higher energy level to a lower energy level. How would the radioisotope of magnesium with atomic mass 27 undergo radioactive decay?.

Various rules of thumb have seen proposed by the scientific community to expalin the mode of radioactive decay by various radioisotopes. One of the major rules is called the n//p ratio. If all the known isotopes of the elemnts are plotted on a graph of number of neutrons (n) versus number of protons (p), it is observed that all isotopes lying outside of a ''stable'' n//p ratio region are radioactive as shown fig.5.28. The graph exhibits straight line behaviour with unit slope up to p=25 . Above p=25 , tgose isotopes with n//p ratios lying above the stable region usually undergo beta decay. Very heavy isotopes (pgt83) are unstable because of their relativley large nuclei and they undergo alpha decay. Gamma ray emission does not involve the release of a particle. It represnts a change in an atom from a higher energy level to a lower energy level. Which of the following represents the relative penetrating power of the three types of radioactive emission in decreasing order?

AAKASH INSTITUTE ENGLISH-CHEMICAL KINETICS-ASSIGNMENT (SECTION C : Previous Year Questions)
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  13. A chemical reaction is catalysed by a catayst X. hence X.

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  18. Activation energy of chemical reaction can be determined by

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