N204 (g) NO2(g) + energy This reaction is said to be O exothermic.
O nonspontaneous
O decreased in entropy.
O endothermic.

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