Common structure
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- Congeners can refer to similar compounds that substitute other elements with similar valences, yielding molecules having similar structures. Examples: potassium chloride and sodium chloride may be considered congeners; also potassium chloride and potassium fluoride. Example: hydrogen peroxide (HOOH), hydrogen thioperoxide (HSOH), and hydrogen disulfide (HSSH). Structural analogs are often isoelectronic.
https://en.wikipedia.org/wiki/Congener_(chemistry)
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