Which statement is true for dipole-dipole forces? A. They are stronger than hydrogen bonding forces. B. They are weaker than London dispersion forces. C. They occur between ions and polar molecules. D. They occur between polar molecules.

I would go with b

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons