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Ch.19 - Nuclear ChemistryWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch.17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Radioactive Decay
Band of Stability
First Order Half Life
Magic Numbers

Magic numbers are an established number of nucleons (either neutrons or protons) that make a nucleus especially stable. 

The Magic NumbersĀ 

Whereas the Octet Rule relates stability to the number of valence electrons, the Magic Numbers relate the stability of the nucleus to the ratio of neutrons to protons. 

Concept #1: Besides the ratio of neutrons to protons, the actual number of neutrons and protons will also affect the overall stability of the nucleus. 

Concept #2: Just as elements with the ideal number of electrons depict unusually high stability so do elements with the ideal number of nucleons (# of protons and neutrons). 

Example #1: Based on your knowledge of nuclide stability determine which of the following nuclides will be most stable.

a) Indium-115    b) Lanthanum-138   c) Calcium-40   d) Neodynium-144