Find potassium in the periodic table and predict how many valence electrons it has

0.66y = 0.9x + 0.48 if y has a value of 108.45 what is the value of x?

What atom has the largest atomic radius

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.