Which example is a weak base?
ethyl alcohol, ammonia, potassium hydroxide or vinegar?

answer; /// i do believe that the correct answer is (a) boiling

gravity causes stares to cluster i think so

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.