What is the mass number for the element? protons: 2 neutrons: 1 electrons: 2
a.) 2
b.) 3
c.) 4
d.) 5

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.