Ch.8 - Periodic Properties of the ElementsWorksheetSee 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: Give the complete electron configuration of cobalt, Co, the complete or abbreviated electron configuration, of Co2+, and Co3+, and predict the number of unpaired electrons in all three.

Solution: Give the complete electron configuration of cobalt, Co, the complete or abbreviated electron configuration, of Co2+, and Co3+, and predict the number of unpaired electrons in all three.

Problem

Give the complete electron configuration of cobalt, Co, the complete or abbreviated electron configuration, of Co2+, and Co3+, and predict the number of unpaired electrons in all three.

Solution

We are being asked to write the electron configuration of neutral Co, Co2+, and Co3+ and how many of unpaired electrons each has. Let’s first write the electron configuration of neutral Co atom.

Neutral element:       Atomic number = # protons = # of electrons


Neutral Cobalt (Co):

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