At a given temperature, the vapor pressure of heptane is 41.0 torr and the vapor pressure of octane is 31.2 torr.
Assuming ideal behavior, what is the vapor pressure of a
solution that contains three times as many moles of
octane as heptane?​

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table?