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: The electron configuration of Gd is [Xe]4f75d16s2. How many unpaired electrons are in this atom?A. 1B. 2C. 7D. 8E. 9

Solution: The electron configuration of Gd is [Xe]4f75d16s2. How many unpaired electrons are in this atom?A. 1B. 2C. 7D. 8E. 9

Problem

The electron configuration of Gd is [Xe]4f75d16s2. How many unpaired electrons are in this atom?

A. 1

B. 2

C. 7

D. 8

E. 9

Solution

We are being asked how many unpaired electrons are present in the atom Gadolinium (Gd). Let’s take a look at the electron configuration given for Gd.

Gd:      [Xe]4f75d16s2


To find the number of unpaired electrons, fill up the 4f, 3d, and 6s subshells of Gd. All of the electrons in lower energy orbitals are paired.

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