Bohrs Model & Lewis structure
(Easy definition/explaining)
Pls !

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:

you need to have a picture of the atom that way we can answer it

the answer is 0.42 is that is an option. this question provides no info