Lewis dot structure of ClO4?, MgF2 , OH?

Dear student
ClO4-
Cl has 7 valence electrons, Each O has six valence electrons, due to the presence of negative charge on the species, an excess electron is available. 
The lewis dot structure is:




Lewis dot structure of MgF2
Mg has configuration (2,8,2)
There are two valence electrons in Mg
Each F has one 7 valence electrons each.


Lewis dot structure of OH-


O has 6 valence electrons around it, because of the negative charge on the radical , there is an excess electron present.
H has one valence electron. Thus O shares valence  electron of H and completes, its octet. H also shares an electron from O, to complete its duplet.

Regards

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