The elements found in group 2a, from top to bottom, include beryllium, magnesium, calcium, strontium, and barium. which of these elements has the highest electronegativity value?

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:

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements