1) Which of the following salts is more soluble in water at 25°C?
BaF2 Ksp = 2.4 x 10
BaCO3 Ksp = 1.6 x 10-9

a police officer and a ambulance

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.