A bottle of wine contains 0.21 moles of ethanol, C2H5OH. The volume of the solution is 0.1 L. Calculate the molarity

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.

it's c. elements are placed in rows based on how may valencies electrons have.

what is the question?