Two elements in the second transition series (y through cd ) have three unpaired electrons in their 3+ ions. what elements fit this description?

The elements that have 3 unpaired electrons in their +3 oxidation states are Molybdenum and Palladium.

Explanation: The elements in the second transition series are:

Yttrium (Y), Zirconium (Zr), Niobium (Nb), Molybdenum (Mo), Technetium (Tc), Ruthenium (Ru), Rhodium (Rh), Palladium (Pd), Silver (Ag) and Cadmium (Cd).

The electronic configuration of these elements are:

            ;      

          ;      

          ;      

          ;    

           ;    

           ;    

           ;    

         ;    

          ;    

         ;    

From the above configurations of the elements in their +3 ionic state, the elements having 3 unpaired electrons are Molybdenum and Palladium.

law of conservation of matter