Answer:
2 electrons will be needed by unbound oxygen in order to fill its 2nd shell.
Explanation:
The chemical reaction between magnesium and oxygen gives magnesium oxide as a product.The reaction is chemically represented as:
[tex]2Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]
Magnesium is a metal of group-2 with 2 valence electrons.It has atomic number of 12.
[tex][Mg]=1s^22s^22p^63s^2[/tex]
In order to attain noble gas configuration it will loose two electrons.
[tex][Mg]^{2+}=1s^22s^22p^6[/tex]
[tex]Mg\rightarrow Mg^{2+}+2e^-[/tex]...[1]
Oxygen is a non metal of group-16 with 6 valence electrons..It has atomic number of 8.
[tex][O]=1s^22s^22p^4[/tex]
In order to attain noble gas configuration it will gain two electrons.
[tex][O]^{2-}=1s^22s^22p^6[/tex]
[tex]O+2e^-\rightarrow O^{2-}[/tex]..[2]
2 electrons will be needed by unbound oxygen in order to fill its 2nd shell.
