I am using the melting points according to which melted first, second,and those that didn't melt within 2 minutes ; solubility in water; solubility in ethanol;and solution conductivity to group the elements.

Answer 1

So I assume you will have several groupings; i.e., group those with similar melting points, group again with solubility in water, again with solubility in ethanol, and another by conductivity.

Answer 2

there should be two groups according to properties. ionic compounds and covalent compounds