20. An aqueous solution that has a hydrogen ion
concentration of 1.0 x 10-8 mole per liter has a pH of
A) 8, which is acidic B) 8, which is basic
C) 6, which is basic D) 6, which is acidic
b

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.