What properties may be used to form ionic compounds

The properties :

crystal shape, high melting points, and electrical conductivity can be used to identify ionic compounds.

to form:

Ionic compounds generally form between elements that are metals and elements that are nonmetals. For example, the metal calcium (Ca) and the nonmetal chlorine (Cl) form the ionic compound calcium chloride (CaCl2). In this compound, there are two negative chloride ions for each positive calcium ion.#answerwithquality #BAL

D. most models represent a real world object in a simpler way

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.