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Standard XII

Chemistry

Stability of Half-Filled and Full-Filled Orbitals

An atomic nuc...

Question

An atomic nucleus having low $n / p$ ratio tries to find stability by :

the emission of an

α

-particle

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the emission of a positron

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capturing an orbital electron (K-electron capture)

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emission of a

β

-particle

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Solution

The correct option is A the emission of a positron
Emission of a positron results in the conversion of a proton into neutron, along with the release of neutrino. Thus, the number of protons decreases and of neutron increases, i.e., $n / p$ ratio increases and the nuclei becomes stable.

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Similar questions

Q. For the

β^{+}

(positron) emission from a nucleus, there is another competing process known as electron capture (electron from an inner orbit, say, the K shell, is captured by the nucleus and a neutrino is emitted).

e^{+} +_{Z}^{A} X \to_{Z - 1}^{A} Y + v

Show that if

β^{+}

emission is energetically allowed, electron capture is necessarily allowed but not vice versa.

Q. A plot of the number of neutrons (

n

) against the number of protons (

p

) of stable nuclei exhibits upward deviation from linearity for atomic number,

Z > 20

. For an unstable nucleus having

n / p

ratio less than

1

, the possible mode(s) of decay is (are)

Q. For the β+(positron) emission from a nucleus, there is anothercompeting process known as electron capture (electron from an innerorbit, say, the K–shell, is captured by the nucleus and a neutrino isemitted).1A A e X Y Z Z ν++ → + −Show that if β+emission is energetically allowed, electron captureis necessarily allowed but not vice–versa.

For the (positron) emission from a nucleus, there is another competing process known as electron capture (electron from an inner orbit, say, the K−shell, is captured by the nucleus and a neutrino is emitted).

Show that if emission is energetically allowed, electron capture is necessarily allowed but not vice−versa.

Q. Decrease in atomic number is observed during :
A)

α

-emission
B)

β

-emission
C) positron emission
D) electron capture

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An atomic nucleus having low n/p ratio tries to find stability by :

The correct option is A the emission of a positronEmission of a positron results in the conversion of a proton into neutron, along with the release of neutrino. Thus, the number of protons decreases and of neutron increases, i.e., n/p ratio increases and the nuclei becomes stable.

An atomic nucleus having low $n / p$ ratio tries to find stability by :

The correct option is A the emission of a positron
Emission of a positron results in the conversion of a proton into neutron, along with the release of neutrino. Thus, the number of protons decreases and of neutron increases, i.e., $n / p$ ratio increases and the nuclei becomes stable.