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

Solution: All the stable isotopes of boron, carbon, nitrogen, oxygen, and fluorine are shown in the chart in the right hand column (in red), along with their radioactive isotopes with t1/2 > 1 min (in blue).

Problem

All the stable isotopes of boron, carbon, nitrogen, oxygen, and fluorine are shown in the chart in the right hand column (in red), along with their radioactive isotopes with t1/2 > 1 min (in blue).
In the 10 neutrons row, 8 protons and 9 protons are both stable. In the nine neutrons row, 8 protons is stable and 9 protons is radioactive with a 110 minute halflife. In the 8 neutrons row, 6 protons is radioactive with a 5715 year halflife, 7 protons is stable, 8 protons is stable, and 9 protons is radioactive with a 64 second halflife. In the 7 neutrons row, 6 protons is stable, 7 protons is stable, and 8 protons is radioactive with a 2 minute halflife. In the 6 neutrons row, 5 protons is stable, 6 protons is stable, 7 protons is radioactive with a 10 minute halflife, and 8 protons is radioactive with a 71 second halflife. In the row for 5 neutrons, 5 protons is stable, and 6 protons is radioactive with a 20 minute halflife.

Which isotope would decay to 12.5 % of its original concentration after 1 hour?