Determine the overall charge on each complex tetraquadichlorochromium (iii)

             +1

Explanation:
                   Molecular Formula of Tetraquadichlorochromium (III) is as follow,

                                               [Cr(H₂O)₄Cl₂]ˣ

The oxidation states of elements present in complex are,

                                  H₂O  =  0     (Neutral Ligand)

                                  Cl  =  -1

                                  Cr  =  +3      (Given)

                                  x  =  Overall charge
So,
                                 [+3 + (0)₄ + (-1)₂]  =  x

                                 [+3 - 2]  =  x

                                          x  =  +1

Result:
            Overall charge on Tetraquadichlorochromium (III) is +1.

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.