Question
Asked Oct 2, 2019
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Predict the ground‑state electron configuration of each ion. Use the abbreviated noble gas notation.
 
Cr2+:
 
 
Cu2+:
 
 
 
Co3+:
 
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Expert Answer

Step 1

The electron configuration of an atom is the representation of the arrangement of electrons distributed among the orbital shells and subshells. Commonly, the electron configuration is used to describe the orbitals of an atom in its ground state, but it can also be used to represent an atom that has ionized into a cation or anion by compensating with the loss of or gain of electrons in their subsequent orbitals.

Electrons are filled in the orbitals in a way to minimize the energy of the atom. Therefore, the electrons in an atom fill the principal energy levels in order of increasing energy (the electrons are getting farther from the nucleus). The order of levels filled is:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d and 7p

The maximum number of electrons each orbital can have are: s = 2, p = 6, d = 10, f = 14

A simple way to remember the order is to follow the below pattern :

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Image Transcriptionclose

p d f n=1 n 2 n=3 3s Зр 3d n 4 4d 4s 4f Ap n=5 5s Sp 5d n 6 6p 6d n=7 n 8 8s 00 >

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Step 2

The electronic configuration of Cr2+, using abbreviated noble gas notation can be written as:

The atomic number of chromium is 24. Therefore, total number of electrons in Cr = 24.

Cr (24) : 1s2 2s2 2p6 3s2 3p6 4s2 3d4     

Cr (24) : [Ar] 4s2 3d4   

Where, [Ar] = electronic configuration of noble gas Argon (18), i.e, 1s2 2s2 2p6 3s2  

Now, Cr loses two electrons to become Cr2+, therefore Cr2+ will have two less electrons than Cr, that is, 22 electrons and its electronic configuration will be :

Cr2+ (22) : [Ar] 3d4   

Step 3

The electronic configuration of Cu2+, using abbreviated noble gas notation can be written as:

The atomic number of copper is 29. Therefore, total number of electrons in Cu = 29.

Cu (29) : 1s2 2s2 2p6 3s2 3p6 4s1 3d10     

Cu (29) : [Ar] 4s1 3d10   

Where, [Ar] = electronic configuration of noble gas Argon (18), i.e, 1s2 2s2 2p6 3s2  ...

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