What is the fourth quantum number of the 3p electron in aluminum, 1s22s22p63s 3p?? A. mg= -1
B. ms = +1/2
c. ms = +1
D. ms = 0​

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 formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)