Question

What are the valence electrons in `MgCl^+`, `CO_2`, and `HF`?

Answer 1

Well magnesium is an `"alkaline earth"`, i.e. a `"Group 2 metal cation"`....

Explanation:

And so for `MgCl^+`; you possibly meant to write `MgCl_2`, i.e. `Mg^(2+) + 2xxCl^-`.

For `CO_2`, we have `4+6+6` valence electrons to distribute; i.e. 8 electron pairs:

`:stackrel(..)O=C=stackrel(..)O:`

And for hydrogen fluoride, we have `1+7` valence electrons, i.e. 4 electron pairs...........

`H-F`.