Question

I have to fill in the blanks of these questions with the elements H (hydrogen), Co (cobalt), Ga (gallium), and O (oxygen), but different sources are telling me different things:

7. Its most common oxidation state is -2

8. A metal with more than one oxidation state

9. Metal with an oxidation number of +3

10. Has oxidation numbers of +1 and -1


Does anyone know which element goes with which criteria? Any help is greatly appreciated! :D

Answer 1

<b>I hope those different sources are not from this forum</b>
I have to fill in the blanks of these questions with the elements H (hydrogen), Co (cobalt), Ga (gallium), and O (oxygen), but different sources are telling me different things:

7. Its most common oxidation state is -2
<b>Most likely oxygen. -2 is most common but it does have -1 in peroxides and -1/2 in superoxides. </b>

8. A metal with more than one oxidation state
<b>Most likely Co since +2 and +3 are common. H and O don't count as answers since they are not metals. So it must be between Co and Ga and Ga is +3. Other oxidation states of Ga are not common.</b>

9. Metal with an oxidation number of +3
<b>Most likely Ga. See 8 above. </b>

10. Has oxidation numbers of +1 and -1
<b>H must go here. +1 is the more common oxidation state but -1 is present in hydrides.</b>
<I> I would take these answers to the bank. :-)</i>

Answer 2

Thanks so much!!!! :D