An atom has a diameter of 4.00 A and the nucleus of that atom has a diameter of 5.50 x 10^-5 A. Determine the fraction of the volume of the atom that is taken up by the nucleus. Assume the atom and the nucleus are a sphere.

Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)

How many neutrons does an element have if its atomic number is 50 and its mass number is 166

What are the similarities between compounds and mixtures?