chem: add isoelectronic ec
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@ -425,6 +425,8 @@ A **full** electron configuration of an element lists each of its orbital sublev
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A **condensed/abbreviated** electron configuration of an element replaces part of the full configuration with the closest noble gas with **less but not equal** electrons enclosed in square brackets.
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The electron configurations of an ion may be the same as a noble gas or another ion. In this case, the two configurations are known as **isoelectronic**.
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!!! example
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The condensed electron configuration of bromine is:
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$$\text{[Ar] 4s}^2\text{ 3d}^{10}\text{ 4p}^5$$
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