Answer:
So I'm sure this is the answer to the eauations
<span>Water is a polar molecule. If a solute dissolved in water is polar molecule, it will dissolve in water. If a solute dissolved in water is non-polar like oil it will not dissolve in water. Polar dissolves in polar.</span>
Aluminum, Carbon, Cobalt, Copper, Zinc, Tantalum
It's K since K and Na are in the same family