Elements in the same group have D. Same number of valence electrons.
N -3
Ba +2
Sr +2
F -1
I -1
Ca +2
Mg +2
S -2
S -2
Al +3
//
Ba3N2
SrF2
CaI2
MgS
Al2S3
//
I don't really understand 2.
The maximum number of covalent bonds formed by a single carbon atom is 4
Answer:
NaCl.
Explanation:
In the solution, ZnSe ionizes to
and
. Following reaction represents the ionization of ZnSe in solution -
⇄ ![Zn^2^+ + Se^2^-](https://tex.z-dn.net/?f=Zn%5E2%5E%2B%20%2B%20Se%5E2%5E-)
As we want to increase the solubility of ZnSe, we must decrease the concentration of dissociated ions so that the reaction continues to forward direction.
If we add NaCl to this solution, then we have
and
in the solution which will be formed by the ionization of NaCl.
Now,
in the solution will react with two
ions to form
as follows -
⇄ ![ZnCl_2](https://tex.z-dn.net/?f=ZnCl_2)
Due to this reaction the concentration of
will decrease in the solution and more ZnSe can be soluble in the solution.
So, what's your question..?. You just gave options..