Figure 1

Periodic table of the elements. Atomic numbers are in the upper left corner of each element’s box; atomic weights are not shown. Group numbers are located above each column of elements. Non-metallic character increases from the bottom left of the table to the upper right; metallic character increases in the opposite direction, from lowest in the upper right corner to highest in the lower left corner. Blue and red arrows indicate directions of increasing ionization energy, electron affinity, and atomic energy. Electron affinity is the amount of energy released when an electron is added to the neutral atom; electronegativity is a measure of an atom’s ability to attract electrons