A group of elements with similar properties, which usually falls into columns on the periodic table. A. period b. ductile c. atomis d. family​

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

Which compound most likely has the greatest bond energy?

What are the two major rules associated with polarity