The following are the classification of each element above:
Nickel - Transitional Metal
Potassium- Alkali Metal
Cadmium- Transitional Metal
Calcium- Alkaline Earth Metal
Barium- Alkaline Earth Metal
I attached a color-coded, labelled period table that will help to see the derivative of my responses.
Oil consists of many B. Covalent bonds between the nonmetals of Carbon, hydrogen and oxygen.
The balanced equation would be 2NaOH + H2SO4 → Na2SO4 + 2H2O