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: Is the following ion diamagnetic or paramagnetic?  Cr

Problem

Is the following ion diamagnetic or paramagnetic? 

 Cr

Solution

We are being asked if the species is paramagnetic or diamagnetic so we have to determine the electron configuration of Cr 

Recall that paramagnetic species have 1 or more unpaired electrons while diamagnetic contains 0 unpaired electrons.

To figure that out, let’s first write the electron configuration of a neutral (uncharged) Cr atom.

Ground-state means that Chromium is in its lowest energy form (not in an excited state). 

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


Neutral Chromium (Cr):

Atomic number = 24
• # of electrons = 24 e-

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