If 20.0 g of magnesium react with excess hydrochloric acid, how many grams of magnesium chloride are produced? Mg + HCl  ___MgCl2 + H2

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