Why the valency of 2,7 is 1
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The valency of 2,7 is 1 because the last shell or orbit only requires one electron to complete the orbit. so it will gain one electron.
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Answer:
Looking at the valency I guess the element must be Fluorine.
Fluorine never donates an electron.
It needs one more electron to attain complete octet.
So it's valency is written as 1 sometimes.
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