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
Sections
The Electron Configuration
The Electron Configuration: Condensed
The Electron Configurations: Exceptions
The Electron Configuration: Ions
Paramagnetism and Diamagnetism
The Electron Configuration: Quantum Numbers
Valence Electrons of Elements
Periodic Trend: Metallic Character
Periodic Trend: Atomic Radius
Periodic Trend: Ionic Radius
Periodic Trend: Ionization Energy
Periodic Trend: Successive Ionization Energies
Periodic Trend: Electron Affinity
Periodic Trend: Electronegativity
Periodic Trend: Effective Nuclear Charge
Periodic Trend: Cumulative
Additional Guides
Atomic Radius
Ionization Energy
LearnAdditional Practice
Next SectionParamagnetism and Diamagnetism

The Electron Configuration of Ions involves either adding or removing electrons from a given orbital of an element.

Electron Configuration of Ions

Concept #1: Electron Configurations (Cations)

Example #1: Write the condensed electron configuration for the titanium (III) ion.

Concept #2: Electron Configurations (Anions)

Example #2: Write the full electron configuration for the nitride ion.

Practice: What is the full electron configuration of the selenide ion?

Practice: Determine the electron configuration for the Cl+ ion.

Practice: Determine the electron configuration and electron orbital diagram for the silver ion.

Previous SectionThe Electron Configurations: Exceptions
Next SectionParamagnetism and Diamagnetism
Additional Problems
Choose the electron configuration for Cr 3+ . A. [Ar] B. [Ar]4s13d2 C. [Ar]4s23d6 D. [Ar]4s23d1 E. [Ar]3d3
The electron configuration of Cr 3+ is 1. [Ar]4s13d5 2. [Ar]3d3 3. [Ar]4s23d1 4. [Ar]4s13d2
The C+ cation has how many total electrons and how many valence electrons? 1. 6; 5 2. 6; 6 3. 7; 6 4. 5; 4 5. 5; 3 6. 6; 4 7. 6; 3 8. 7; 5 9. 7, 8
If the ground state electron configuration of an element is [Ar]3d 104s24p3, what is the typical charge on the monatomic ion of the element ? a. +2 b. +1 c. -1 d. -2 e. -3
Write the electron configurations for the following elements and ions. a) V2+         b) Sn         c) Pb2+  
Choose the ground state electron configuration for Mn 4+. a.  [Ar] b.  [Ar]4s13d4 c.  [Ar]4s23d1 d.  [Ar]4s23d9 e.  [Ar]3d3
 Write the electronic configuration for the following elements and ions: i. Os                    ii. Ni2+                iii. Se3+              
Which of the following is the correct electron configuration for nitride ion? a) 1s22s22p3 b) 1s22s22p4 c) [He] d) 1s22s22p6 e) 1s22s2
Which species has this ground-state electron arrangement? 1s22s22p63s23p63d10 (A) Ni (B) Ni2+ (C) Zn (D) Zn2+
Choose the ground state electron configuration for Fe 2+. a. [Ar]4s03d2 b. [Ar]4s2 c. [Ar]4s23d6 d. [Ar]4s03d6 e. [Ar]4s23d4
Which of the following statements is/are true? i. the electron configuration of copper, Cu, is  [Ar]4s 23d9 ii. the electron configuration of iron(II), Fe2+, is  [Ar]3d 6 iii. the electron configuration of molybdenum, Mo, is [Kr]5s14d5 a. i only b. ii only c. iii only d. i and ii  e. ii and iii
What is the electronic configuration of Ga 3+ ion? ( Ga has an atomic number of 31 ) a. [Ar] 4s1 3d9 b. [Ar] 3d10 c. [Ar] 4s2 3d8 d. [Ar] 4s1 4d9 e. [Ar] 4s2 4d8
The electronic configuration of Zn2+ is  A. [Ar] 4s2 3d10 B. [Ar] 4s0 3d10 C. [Ar] 4s2 3d8 D. [Ar] 4s2 4d8 E. [Ar] 4s0 4d10
What is the expected ground state electron configuration for Zr 2+ ? 1. [Xe] 6s25d4 2. [Kr] 5s24d2 3. [Kr] 5s24d4 4. [Xe] 6s 2 5. [Kr] 5s 2 6. [Kr] 4d 2 7. [Xe] 8. [Xe] 5d 2 9. [Kr] 10. [Kr] 5s14d5
An element E has the electronic outer shell configuration ns2 np4. What is the formula of its compound with lithium? A) LiE2 B) LiE C) Li2E D) Li4E E) LiE4
For the ground-state ion Bi3+ , what type of orbital do the electrons with highest energy reside in? 5d 6s 4f 5p 6p
When forming cations, electrons are removed first from orbitals that are bigger rather than necessarily those with higher energy. Given this, what is the electron configuration of the cobaltic cation, Co3+? (A) [Ar] 4s2 3d7 (B) [Ar] 4s2 3d4 (C) [Ar] 3d5 (D) [Ar] 4s2 3d10 (E) [Ar] 3d6
What is the electron configuration of Fe3+? a) [Ar]4s23d5  b) [Ar]4s23d3  c) [Ar]3d5  d) [Ar]4s13d4  e) [Ar]3d7
Magnesium and sulfur react to form MgS, an ionic compound. The magnesium ion, Mg2+, has ______ electrons in its highest occupied energy level. a. 8b. 2c. 10d. 4e. 5
Which of the following ions have the same ground state electron configuration:  Sn 4+ , Pb 4+ , Sr 2+ , Br - a. Sn and Pb b. Pb and Src. Sr and Brd. Pb and Br e. Sn , Sr, and Br
Molybdenum (Mo) is an element in which the spin pairing energy is > than the promotion energy.  With that in mind write the electron configuration for the neutral atom and the +1 ion.a. Mo      b. Mo1+   
Choose the valence orbital filling diagram that best represents the ground state of Br -.
Give the ground state electron configuration for Br -. (A) [Ar]4s23d104p5 (B) [Ar] 4s24p6 (C) [Ar]4s24p6 (D) [Ar]4s24d104p4 (E) [Ar]4s23d104p6
What is the electronic configuration of a stable sulfide ion?a) 1s22s22p6b) 1s22s22p63s2c) 1s22s22p63s23p4d) 1s22s22p63s23p3e) 1s22s22p63s23p6
The electronic configuration of the Al 3+ ion is a) 1s22s22p6b) 1s22s22p63s23p1c) 1s22s22p63s23p4d) 1s22s22p3e) 1s22s22p1
What is the electron configuration of Ni 2+?a) [Ar] 3d6 4s2b) [Ar] 3d7 4s1c) [Ar] 3d8d) [Ar] 3d8 4s2e) [Ar] 3d8 4s1
All of the following ions have the electronic configuration of a noble gas   except  a) Al3+ b) H - c) Ga3+ d) Cl - e) Ca2+
A student wrote that an element had the electron configuration 1s22s22p63s23p64s23d10.  If the element forms an ion, what is its most likely charge?a) +1b) +2c) –2d) –6e) 0, it is a noble gas
A gas phase atom with the electron configuration 1s22s22p63s23p64s23d6 loses three electrons. What is the electron configuration of the resulting gas phase ion? a) 1s22s22p63s23p63d5 b) 1s22s22p63s23p64s13d4 c) 1s22s22p63s23p64s23d3 d) 1s22s22p63s23p54s13d5
In what respect does an atom of magnesium, Mg, differ from a magnesium ion, Mg2+?(A) The ion has two or more planetary electrons than the atom.(B) The ion has two more protons than the atom.(C) The ion has an inert gas electron configuration; the atom does not.(D) The positive charge on the nucleus of the ion is two units greater than the nuclear charge on the atom.
Ions also have electron configurations (Section 7.4). Cations have fewer valence electrons, and anions have more valence electrons, respectively, than their parent atoms. For example, chloride, Cl–, has an electron configuration of 1s22s22p63s23p6, for a total of 18 electrons, compared to 17 for neutral chlorine, the element. Na has an electron configuration of 1s22s22p63s1, but Na+ has an electron configuration of 1s22s22p6 Write out the electron configurations for (a) F–,
Ions also have electron configurations (Section 7.4). Cations have fewer valence electrons, and anions have more valence electrons, respectively, than their parent atoms. For example, chloride, Cl–, has an electron configuration of 1s22s22p63s23p6, for a total of 18 electrons, compared to 17 for neutral chlorine, the element. Na has an electron configuration of 1s22s22p63s1, but Na+ has an electron configuration of 1s22s22p6 Write out the electron configurations for (b) I–,
Ions also have electron configurations (Section 7.4). Cations have fewer valence electrons, and anions have more valence electrons, respectively, than their parent atoms. For example, chloride, Cl–, has an electron configuration of 1s22s22p63s23p6, for a total of 18 electrons, compared to 17 for neutral chlorine, the element. Na has an electron configuration of 1s22s22p63s1, but Na+ has an electron configuration of 1s22s22p6 Write out the electron configurations for (c) O2–,
Ions also have electron configurations (Section 7.4). Cations have fewer valence electrons, and anions have more valence electrons, respectively, than their parent atoms. For example, chloride, Cl–, has an electron configuration of 1s22s22p63s23p6, for a total of 18 electrons, compared to 17 for neutral chlorine, the element. Na has an electron configuration of 1s22s22p63s1, but Na+ has an electron configuration of 1s22s22p6 Write out the electron configurations for (d) K+,
Ions also have electron configurations (Section 7.4). Cations have fewer valence electrons, and anions have more valence electrons, respectively, than their parent atoms. For example, chloride, Cl–, has an electron configuration of 1s22s22p63s23p6, for a total of 18 electrons, compared to 17 for neutral chlorine, the element. Na has an electron configuration of 1s22s22p63s1, but Na+ has an electron configuration of 1s22s22p6 Write out the electron configurations for (e) Mg2+,
Ions also have electron configurations (Section 7.4). Cations have fewer valence electrons, and anions have more valence electrons, respectively, than their parent atoms. For example, chloride, Cl–, has an electron configuration of 1s22s22p63s23p6, for a total of 18 electrons, compared to 17 for neutral chlorine, the element. Na has an electron configuration of 1s22s22p63s1, but Na+ has an electron configuration of 1s22s22p6 Write out the electron configurations for (f) Al3+,
 Give the electron configuration for the Ti 2+ ion.
Write the electron configurations for the following ions or elements:example: Mg [Ne](3s)2a) Sib) Ir3+c) Se    
Which of the following is the correct electron configuration for the ferric cation?A. [Ar]4s2 3d3B. [Ar]4s2 3d4C. [Ar]4s2 3d6D. [Ar]3d5E. [Ar]3d6
What is the electron configuration for the Ni 2+ ion?a. [Ar]3d 8 4s 2b. [Ar]3d 10 4s 2c. [Ar]3d 7 4s 1d. [Ar]3d 8e. [Ar]3d 6 4s 2
The electron configuration for the Os 3+ ion is:A) [Xe] 4f13 5d6B) [Xe] 5s2 4f11 5d6C) [Xe] 5s2 4f14 5d6D) [Xe] 4f14 5d5E) [Xe] 5s2 4f14 5d3
What is the electron configuration of a nitride ion in its ground state? 
Write the electron configuration of Co3+ (Cobalt 3+ ion). Explain.
The electron configuration of an Fe2+ ion is ________.a) [Ar]4s24d 4b) [Ar]4s23d 6c) [Ar]3d 3d) [Ar]3d 5e) [Ar]3d 6
a) Write the electron configuration for Ni 2+.b) Write the electron configuration for Br −.
What is the charge on the most stable ion of each of the following elements?K, N, Mg, S, Ba, Al, I, O
What is the electron configuration for the Ca 2+ ion (calcium ion)?
What element forms an ion with an electronic configuration of [Kr] and a - 2 charge? Give the symbol for the element.
What is the ground-state electron configuration of the oxide ion O 2-? Express your answer in condensed form, in order of increasing orbital energy.
What is the ground state electron configuration of the sulfide ion S 2-?
What is the ground-state electron configuration of the chloride ion Cl −? Express your answer in condensed form, in order of increasing orbital energy.
Write electron configuration for the following ion.Ru3+Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. 
What is the ground-state electron configuration of the sulfide ion S 2-? Express your answer in condensed form, in order of increasing orbital energy. 
What is the ground-state electron configuration of the fluoride ion F -? Express your answer in condensed form, in order of increasing orbital energy.
Enter the condensed electron configuration for the following three ions:a. Co2+b. N3−c. Ca2+
Enter the full electron configuration for Cl–.
What is the electron configuration of Mo3+?
Write the electron configuration for  O2–.
What is the correct electron configuration of a magnesium ion, Mg 2+ ?A. [Ne] 3s1      B. [Ne]      C. [Ar]      D. [Ar] 3s1      E. [Ne] 3s2
Which of the following is the correct noble gas electron configuration for an ion of barium?a) [Kr]5s24d105p66s2b) [Kr]5s25p6 c) [Kr] 5s24d105p66s1d) [Kr] 5s24d105p6 e) [Kr] 5s24d105p66s26p2
Write the electron configuration for Se2 - .
How many valence electrons are in Ne2+? 
How many electrons does a stable gallium,  31Ga3+, ion have?a) 28b) 29c) 30d) 31e) 36
Complete the ground-state electron configuration for Zinc ion  and Thallium(lll) ion (using the noble gas abbreviation) and identify the charge.
Write electron configuration for the following ion.Y3+Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. 
Write the electron configuration for  Sn2+.
What is the ground-state electron configuration of the fluoride ion F−?Express your answer in condensed form, in order of increasing orbital energy.
What element forms an ion with an electronic configuration of [Xe] and a -2 charge? Give the symbol for the element.
Electron configuration for Ru3+.
Write electron configuration for the following ion.As3−Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. 
Enter the full electron configuration for P3-. What is the atomic symbol for the noble gas that also has this electron configuration?
Nonmetals gain electrons under certain conditions to attain a noble-gas electron configuration. How many electrons must be gained by the element O? Which noble-gas electron configuration is attained in this process? (i) xenon (ii) krypton (iii) helium (iv) radon (v) argon (vi) neon
Predict the ground-state electron configuration of the following ions. Write your answers in abbreviated form, that is, beginning with a noble gas in brackets.(a) Ru2+ :(b) : W3+ :