![]() (b) Covalent radii of the elements are shown to scale. ![]() Therefore, these elements take on the nonmetallic character of forming anions. The atomic radius for the halogens increases down the group as n increases. As you move across the table from left to right, the metallic character decreases, because the elements easily accept electrons to fill their valance shells. ![]() The elements with properties intermediate between those of metals and nonmetals are called metalloids (or semi-metals). 1: (a) The radius of an atom is defined as one-half the distance between the nuclei in a molecule consisting of two identical atoms joined by a covalent bond. They are located on the right side of the periodic table. If they are solid, they tend to be brittle. Non-metals can be solids, liquids, or gases. They are located on the left side of the periodic table. An amphoteric oxide is one which shows both acidic and basic properties. The metallic character increases as you go down a group. \), metals occupy the left three-fourths of the periodic table, while nonmetals (except for hydrogen) are clustered in the upper right-hand corner of the periodic table. Metals tend to be shiny, hard, malleable and good conductors of electricity. The trend in acid-base behavior can be summarized as follows: Acidity increases from left to right, ranging from strongly basic oxides on the left to strongly acidic ones on the right, with an amphoteric oxide (aluminum oxide) in the middle. Reactivity of metals is based on processes such as the formation of halide compounds with halogens.
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