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Selenium is a group 16 element. It has 6 electrons in its valence shell and simply on that basis would be predicted to be divalent. and that is found to be true with compounds such as H2Se, However like sulfur it is capable of other valencies.

It can be tetravalent, examples are SeO2 (which is chain polymer) and SeF4.

It can also be hexavalent in SeF6, an octahedral molecular compound.

And it can appear to be monovalent in for example Se2Cl2 which is actually Cl-Se-Se-Cl.

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11y ago
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13y ago

2,4,6

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Q: What is the valence of selenium?
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