Which of the following items is a chemical property? Which of the following items is a chemical property? the melting and boiling point of water the tarnishing of a copper statue the odor of spearmint gum the paint color on a new red Corvette none of the above

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.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.