Question 1 options: potassium forms ions with a charge of +1 (ka+). iodine forms ions with a charge of -1. selenium forms ions with a charge of -2 ( imagine that potassium ions and selenide ions combine to form potassium selenide. what numbers would be in the place of x and y in: kxsey (use the number 1 even if it isn't strictly necessary) x= y=

X = 2

Y = 1

As we know the potassium selenide will be a balanced ionic compound having net charge of zero.

So K has +1 charge and Se has -.

So if we take one ion of Se -2 the we have to take 2 ions of K which have +1 charge.

K2 = +2,   1Se = -2

Then net charge will zero. Hence the formula of potassium selenide is K2Se.

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

b.

the accuracy of the data.