Cork has a density of about 0.60 g/cm3. Cork will partially float in water which has a density of 1.0 g/cm3. If the piece of cork has a total volume of 4.0 cm3 what volume of cork is ABOVE the water?

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.