1.

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 gt 20. For an unstable nucleus having n//p ratio less than 1, the possible mode (s) of decay is (are)

Answer»

`beta^(-) -` decay (`beta` EMISSION)
Orbital or K-electron capture
Neutron emission
`beta^(+) -` decay (positron emission)

Solution :`(n)/(p) lt 1`
Positron emission `OVERSET(.^(a)X^(b))rarr + ._(1)^(0)e + ._(a -1)Y^(b)`
`rArr K -` electron capture
`._(a)X^(b) + ._(-1)e^(0) rarr ._(a -1)Y^(b)`
both process cause an increase in n/p ratio towards 1 THUS STABILISING the nucleus


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