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The n//p ratio for a stable lighter nucl...

The `n//p` ratio for a stable lighter nuclei is about `………………` .

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Unstable nuclei attain stability through disintergration. The nuclear stability is related to neutron- proton ratio (n//p) . n//p ratio for stable nuclei lies quite close to unity for elements with low atomic numbers ( 20 or less) but it is more than one for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. (i) When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays, i.e. a neutron is converted into a proton. (ii) When n//p ratio is lower than required for stability, the nuclei increase the ratio, either by emitting alpha -particle or by emitting a positron or by K -electron capture. beta -particle is emiited in radioactivity by

Unstable nuclei attain stability through disintergration. The nuclear stability is related to neutron- proton ratio (n//p) . n//p ratio for stable nuclei lies quite close to unity for elements with low atomic numbers ( 20 or less) but it is more than one for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. (i) When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays, i.e. a neutron is converted into a proton. (ii) When n//p ratio is lower than required for stability, the nuclei increase the ratio, either by emitting alpha -particle or by emitting a positron or by K -electron capture. Consider the following nuclear reactions, ""_(92)^(238)M to _(y)^(x)N+2_(2)^(4)He , ""_(y)^(x)N to _(B)^(A)L+2beta^(+) The number of neutrons in the element L is

Knowledge Check

  • For a stable nuclei the

    A
    Biding energy is large
    B
    Binding energy per nucleons is large
    C
    Packing fraction is very large
    D
    Packing fraction is very small

  • The n/p ratio for ._(1)H^(1) is :

    A
    1
    B
    2
    C
    3
    D
    Zero

  • Unstable nuclei attain stability through disintergration. The nuclear stability is related to neutron- proton ratio (n//p) . n//p ratio for stable nuclei lies quite close to unity for elements with low atomic numbers ( 20 or less) but it is more than one for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. (i) When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays, i.e. a neutron is converted into a proton. (ii) When n//p ratio is lower than required for stability, the nuclei increase the ratio, either by emitting alpha -particle or by emitting a positron or by K -electron capture. ""_(13)^(27)Al is a stable isotope , ""_(13)^(29)Al is expected to disintegrate by-

    A
    `alpha`-emission
    B
    `beta`-emission
    C
    positron emission
    D
    proton emission

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    When n//p ratio of an isotope is greater than the stable isotope of that element, it emits

    Radioactive elements can be categorised into (a) Neutron rich nuclide (b) Neutron poor nuclide In order to achieve stable n/p ratio these nuclide either emits beta^(-),beta^(+) (positron) or alpha -particle depending upon the n/p ratio of unstable nuclei and stable nuclei ._(53)P^(135) rarr Q+a Q rarr R+b [Note : only stable isotope of element P and Q are ._(53)P^(135) and ._(54)Q^(137) respectively] Element P,Q,R do not show any resemblence to currently known element Particles a and b can be respectively

    Radioactive elements can be categorised into (a) Neutron rich nuclide (b) Neutron poor nuclide In order to achieve stable n/p ratio these nuclide either emits beta^(-),beta^(+) (positron) or alpha -particle depending upon the n/p ratio of unstable nuclei and stable nuclei ._(53)P^(135) rarr Q+a Q rarr R+b [Note : only stable isotope of element P and Q are ._(53)P^(135) and ._(54)Q^(137) respectively] Element P,Q,R do not show any resemblence to currently known element ._(53)P^(135) rarr Q+a,t_(1//2)=1000 hrs Q rarr R+b,t_(1//2)=10 min Number of nuclei of Q and R respectively after 1000 hr if we start with 2 mol P [N_(A)=6xx10^(23)]

    Unstable nuclei attain stability through disintegration. The nuclear stability is related to neutron proton ratio (n//p) . For stable nuclei n//p ratio lies close to unity for elements with low atmoic numbers (20 or less) but it is more than 1 for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays. while when n//p ratio is lower than required for stability, the nuclei either emits alpha -particles or a positron or capture K -electron.

    Unstable nuclei attain stability through disintegration. The nuclear stability is related to neutron proton ratio (n//p) . For stable nuclei n//p ratio lies close to unity for elements with low atmoic numbers (20 or less) but it is more than 1 for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays. while when n//p ratio is lower than required for stability, the nuclei either emits alpha -particles or a positron or capture K -electron.

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