Upper F superscript minus in red plus upper H upper S upper O subscript 4 superscript minus right arrow upper H upper F plus upper S upper O subscript 4 superscript 2 minus. Arrhenius acid Bronsted-Lowry acid Arrhenius base Bronsted-Lowry base

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:

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.