What is the percent concentration of a sodium fluoride solution made by dissolving 65.4 grams of sodium fluoride in 125.1 grams of water?

34.33 %.

Explanation:

W% = [(W of solute NaF)/(W of solution)] x 100.

W of solute NaF = 65.4 g.

W of solution = W of solute NaF + W of water = 65.4 g + 125.1 g = 190.5 g.

∴ W% = [(W of solute NaF)/(W of solution)] x 100 = [(65.4 g)/(190.5 g)] x 100 = 34.33 %.

these nuts

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.