(a) a family of 932 directions (b) the specific 932 direction (c) a family of 932 planes (d) the specific 932 plane (e) a mixture of 932 directions and planes

idk i’m struggling too

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.