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Q.

Which of the given pairs of atoms contain(s) the same number of neutrons?
I) $_{48} C d^{114}, a n d_{50} S n^{119}$ II) $_{27} C o^{59}, a n d_{28} N i^{59}$
III) $_{55} C s^{133}, a n d_{54} X e^{132}$ IV) $_{29} C u^{63}, a n d_{29} C u^{65}$

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a

I and III only

b

IV only

c

I and IV only

d

III only

answer is C.

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Detailed Solution

$_{55} C s^{133}, a n d_{54} X e^{132}$ .

No. of neutrons $(n) = A - Z$

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