The radius of a calcium ion is smaller than the radius of calcium atom beacuse the calcium ion contain the same nuclear charged and

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .