How is electronegative used in determining the ionic or covalent character of the bonding between two elements

If difference of EN < 0.4, non polar covalent bond

If difference of EN is 0.41 - 1.69, polar covalent bond

If difference of EN > 1.7, ionic bond

Most are usually covalent (ideal type)
To get the difference of electronegativity, subtract the smaller atomic mass of the element from the bigger one.

Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid