Interpret Data Hannah started with a 25-mL sample of pond water. Without shaking the sample, she poured 5 mL through a piece of filter paper. She repeated this with four more pieces of filter paper. She dried each piece of fil-ter paper and measured the mass of the sediment. Why did the last sample have
a higher mass than did the first sample?

The last sample had a higher mass than the first sample because when the particles in the water are not evenly distributed by shaking, the sediment is settled down, which leads the pond water in the bottom to have more sediment than the water from the top.

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.