12. Definitions of some nuclides:
13. Nuclear stability:
14. SoddyFajan group displacement law:
15. Some important mathematical relations:
A. kt = 2.3031og(N_{0}/N);
B. t_{1/2} = 0.693/k;
C. t_{av } 1/k
where, N_{0} = no. of radioactive atoms present initially,
N = no. of radioactive atoms present after time t,
k = rate constant,
t_{1/2 =} Halflife period and t_{av} = Average life period.
16. There are four disintegration series.
These are:
1. Thorium series (4n),
2. Uranium series (4n+2),
3. Actinium series (4n+3) and
4. Neptunium series (4n+1).
The first three of them are naturally occurring while the last one is artificially made.
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