Answer quickly this is due by 8: 00pm eastern time! extra points! does a positive result make you 100 % confident the ion is there? what about negative results? are you more confident with one or the other? why?

a qualitative test is never perfectly accurate, so there is a reasonable amount of doubt associated with either side, but a negative result is usually easier to determine because there is less room for error in saying that something is not happening than in saying it is.

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.