Points to be Remembered: Radioactivity Notes - Chemistry

Chemistry: Points to be Remembered: Radioactivity Notes - Chemistry

The document Points to be Remembered: Radioactivity Notes - Chemistry is a part of Chemistry category.
All you need of Chemistry at this link: Chemistry

12. Definitions of some nuclides:

Isotopes: Species with same no. of protons but different mass no. Example - 1H1, and 2H1.

Isotones: Species with same no. of neutrons but different no. of protons. Example - 14C6 and 15N7.

Isobars: Species with same mass no. but different no. of protons. Example - MC,5 and 15N7.

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 a-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 Points to be Remembered: Radioactivity Notes - Chemistry is a part of Chemistry category.
All you need of Chemistry at this link: Chemistry
Use Code STAYHOME200 and get INR 200 additional OFF
Use Coupon Code

Download free EduRev App

Track your progress, build streaks, highlight & save important lessons and more!

Related Searches

Exam

,

Summary

,

past year papers

,

ppt

,

Viva Questions

,

study material

,

Free

,

mock tests for examination

,

Semester Notes

,

Points to be Remembered: Radioactivity Notes - Chemistry

,

Extra Questions

,

Sample Paper

,

Objective type Questions

,

Previous Year Questions with Solutions

,

MCQs

,

practice quizzes

,

shortcuts and tricks

,

Important questions

,

pdf

,

video lectures

,

Points to be Remembered: Radioactivity Notes - Chemistry

,

Points to be Remembered: Radioactivity Notes - Chemistry

;