Which kind of atoms would typically form an ionic bond?

2 atoms that have very different electromagnetically

Explanation:

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:

6.4 cm (max) - 25 cm (min)