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CGPET 2013 Solved Paper

Section: Chemistry

Question : 70 of 150

Marks: +1, -0

Solution:

The stability of a nucleus depends upon the neutron to proton

\left(\frac{n}{p}\right)

ratio in the nucleus.

Thus,

(i) The lower elements (upto

Z=20

), the stable nuclei have about equal number of protons and neutrons i.e.,

\frac{n}{p}=1

e.g.,

\mathrm{{}_{20}^{40}Ca},\mathrm{{}_{13}^{27}Al}

(ii) For higher elements to be stable, there must be more neutrons than protons i.e.,

\frac{p}{p}>1

. e.g.,

\mathrm{{}_{25}^{55}Mn},\mathrm{{}_{50}^{119}Sn}

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