An 800 g solution of kool-aid contains 780 g of water. what is the mass percent of solute in this solution?

Mass % = (mass of solute /Mass solution) * 100

= (20 /800) * 100

=2.5 %

Hence, mass % is 2.5

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.