Assuming ideal solution behavior, what is the osmotic pressure of an aqueous solution of 1.64 g of ca(no3)2 in water at 25 °c? the volume of the solution is 275 ml.

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.