Number of Protons Number of Neutrons Atomic Number Mass Number Element (symbol) A 7 B 15 C D E 26 56 F Using the periodic table, complete the table to describe each atom. Type in your answers. A 7 С D E D 18 of 23

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.

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technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.