Consider the following statements ( X and Y s | vedclass

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Question

(c)

For a nucleus, ${ }_Z^A X$

Mass number, $A=N+Z$

where, $N=$ number of neutrons

and $Z=$ number of protons.

In ${ }_{32}^{65} X$ and

Vedclass · Accepted Answer

Only statements $II, III$ and $IV$ are correct

Vedclass · Answer

(c)

For a nucleus, ${ }_Z^A X$

Mass number, $A=N+Z$

where, $N=$ number of neutrons

and $Z=$ number of protons.

In ${ }_{32}^{65} X$ and ${ }_{33}^{65} Y$, number of protons are different. So, these are not isotopes.

In ${ }_{42}^{86} X$ and ${ }_{42}^{85} Y$, number of protons are equal. So, these are isotopes.

In ${ }_{85}^{174} X$ and ${ }_{88}^{177} Y$, number of neutrons are $174-85=89$ and $177-88=89$.

So, both have same number of neutrons.

In ${ }_{92}^{235} X$ and ${ }_{94}^{235} Y$, both have same mass number, so these are isobars.

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