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Standard XII

Physics

Nuclear Stability

In stable nuc...

Question

In stable nuclei the number of protons $(Z)$ and number of neutrons $(N)$ are related as

N

Z

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N

Z

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N

Z

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N

Z

0

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Solution

The correct option is A $N$ = $Z$
Nuclei which lie on the stability line are stable nuclei. From the plot it can be seen that many of the stable nuclei have equal number of protons and neutrons. These are usually the elements in the lighter section of the periodic table. For the heavier stable nuclei the there are approximately 50% more neutrons to protons.

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Similar questions

Q. In most stable nuclei, neutron number

N

and proton number

Z

has the relation

Q. Assertion :Light nuclei are most stable if

N = Z

, while heavy nuclei are more stable if

N > Z

. (

N \to

number of neutrons,

Z \to

number of protons). Reason: As the number of protons increases in a nucleus, the Coulomb's repulsive force increases, which tends to break the nucleus apart. So, to keep the nucleus stable, more number of neutrons are needed which are neutral in nature.

Q. For a nucleus to be stable, the correct relation between neutron number N and Proton number Z is

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)

Show that the minimum energy needed to separate a proton from a nucleus with Z protons and N neutrons is $△ E = (M_{z - 1, N} + M_{H} - M_{Z, n}) C^{2}$ Where $M_{Z, n}$ = mass of an atom with Z protons and N neutrons in the nucleus and $M_{H}$ = mass of a hydrogen atom. This energy is known as proton-separation energy.

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In stable nuclei the number of protons (Z) and number of neutrons (N) are related as

In stable nuclei the number of protons $(Z)$ and number of neutrons $(N)$ are related as