An element X of atomic number 12 combines with an element Y of atomic number 17 to form a compound XY2. State the nature of the chemical bond in XY2 and show how the electron configuration of X and Y change in the formation of this compound.
An element A has 4 valence electrons in its atom whereas element B has only one valence electrons its atom. The compound formed by A and B does not conduct electricity. What is the nature of chemical bond in the compound formed ? Give its electron dot structure.