For chemistry, what is a common unit for density?

commonly used

kilograms per cubic meter(kg/m³) and

grams per cubic centimeter(g/cm³)

Explanation:

hope it helps you

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:

increased stability in the completion of fluorine's outer shell.