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Why Chromium has only one valence electron?

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If you take a look at where Chromium is on the periodic table, it is one electron away from having 5 electrons in its 3d-subshell and a greater overall stability. read more

If you take a look at where Chromium is on the periodic table, it is one electron away from having 5 electrons in its 3d-subshell and a greater overall stability. Hence, In order to achieve this more desirable state, one of the 4s electrons is promoted to the 3d sub shell, achieving the half-full orbital and resulting in only one electron remaining in the 4s (valence) shell. read more

That’s why it forms stable compounds with a single hydrogen atom and why it has a high electronegativity (which gives you an estimate of how likely it is to accept an electron in a chemical bond). But chromium has 4 electrons out of 10 in its valence subshell and might prefer to lose them rather then bond with 6 hydrogen atoms. read more

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Source: dlrgenchem.com