Susan was traveling in an airplane. she looked out of a window in the airplane and saw clouds in the sky. why could susan see clouds to the window of the airplane?

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent