Document of Radioactivity Notes | Study Inorganic Chemistry - Chemistry

Chemistry: Document of Radioactivity Notes | Study Inorganic Chemistry - Chemistry

The document Document of Radioactivity Notes | Study Inorganic Chemistry - Chemistry is a part of the Chemistry Course Inorganic Chemistry.
All you need of Chemistry at this link: Chemistry

Points to be Remembered

12. Definitions of some nuclides:

  • Isotopes: Species with same no. of protons but different mass no. Example - 'H, and 2H|.
  • Isotones: Species with same no. of neutrons but different no. of protons. Example - l4C6 and l5N7.
  • Isobars: Species with same mass no. but different no. of protons. Example - MC,5 and l5N7.
  • Mirror Nuclei: Species in which the difference between the no. of protons and neutrons are unity. Example - 3H1 and 3He2.

13. Nuclear stability:

  • Even-odd nature of nucleons (Harkin's Rule): Nuclei having even no. of protons and neutrons are more stable and most abundant.
  • Neutron to Proton ratio (n/p): Nuclei having n/p ratio close to unity is more stable.
  • Packing Fraction (PF): Negative value in packing fraction indicates the stability of nuclei. Greater is the negative packing fraction value of a nuclei, higher will be its stability.
  • Nuclear Binding Energy (NBE): Positive value in nuclear binding energy indicates the stability of nuclei. Greater is the positive nuclear binding energy value of a nuclei, higher will be its stability.
  • Magic no.: Nuclei having 2, 8, 20, 50, 82 or, 126 no. of protons or, neutrons are more stable. These nos. are called magic nos.

14. Soddy-Fajan group displacement law:

  • When an ∝-particle is emitted by an element, it mass and atomic no. will be decreased by four and two units respectively.
  • When an β-particle is emitted by an element, it mass no. will remain same but atomic no. will be increased by one unit.

15. Some important mathematical relations:
A. kt = 2.3031og(N0/N);
B. t1/2 = 0.693/k;
C. tav ----- 1/k
where, N0 = no. of radioactive atoms present initially,
N = no. of radioactive atoms present after time t,
k = rate constant,
t1/2 = Half-life period and tav = 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.

The document Document of Radioactivity Notes | Study Inorganic Chemistry - Chemistry is a part of the Chemistry Course Inorganic Chemistry.
All you need of Chemistry at this link: Chemistry
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