Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. Ionic bonds generally form when the bonded elements have a difference in electronegativity greater than 1.5 What is the electronegativity difference between aluminum and oxygen will these two atoms form an iconic or covalent compound A. 5.0 ionic compound

B. 5.0, covalent compound

C. 2.0, Covalent compound

D. 2.0, ionic compound

Explanation:

I believe its A.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.