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Ch.7 - Periodic Properties of the Elements
Chapter 7, Problem 29a

Which neutral atom is isoelectronic with each of the following ions? Ga3+, Zr4+, Mn7+, I, Pb2+.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Isoelectronic Species

Isoelectronic species are atoms, ions, or molecules that have the same number of electrons, resulting in identical electron configurations. This concept is crucial for determining which neutral atom corresponds to a given ion, as it allows for the comparison of electron counts despite differences in charge.
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Electron Configuration

Electron configuration describes the distribution of electrons among the various orbitals of an atom. Understanding how to write and interpret electron configurations is essential for identifying isoelectronic species, as it reveals how many electrons a neutral atom or ion possesses and how they are arranged.
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Electron Configuration Example

Charge and Electron Count

The charge of an ion indicates the number of electrons lost or gained compared to its neutral atom. For example, a +3 charge means the ion has three fewer electrons than its neutral counterpart. This relationship is fundamental when determining which neutral atom is isoelectronic with a given ion, as it directly affects the total electron count.
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