3. what information about a representative element can you get from just knowing its group number?
the number of electrons it has in the highest occupied energy level

How many neutrons does a atom of cobalt have?

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?

What does the symbol (–hfus) indicate in a phase change?