![]() Note that there is no clear division between metallic and non-metallic character. Fluorine gas reacts explosively with many other elements and compounds, and is considered to be one of the most dangerous known substances. It is not found in nature as a free element. Since the noble gases are a special group because of their lack of reactivity, the element fluorine is the most reactive nonmetal. The most reactive nonmetals reside in the upper right portion of the periodic table. ![]() Nonmetals tend to gain electrons in chemical reactions, and have a high attraction for electrons within a compound. In addition, the atomic radius increases going down a group, placing the outer electrons further away from the nucleus and making that electron less attracted by the nucleus. Since the ionization energy decreases going down a group (or increases going up a group), the increased ability for metals lower in a group to lose electrons makes them more reactive. ![]() The metallic character increases as you go down a group. Reactivity of metals is based on processes such as the formation of halide compounds with halogens, and how easily the element displaces hydrogen from dilute acids. These metals are highly reactive and form ionic compounds (when a nonmetal and a metal come together) as well as many other compounds. For example: Na0 Na+ +e (2.11.1) (2.11.1) N a 0 N a + + e. The Alkali metals are comprised of group 1 of the periodic table and consist of Lithium, Sodium, Rubidium, Cesium, and Francium. are oxidized) when they undergo chemical reactions They normally do not accept electrons. (Credit: User:Mirek2/Wikimedia Commons Source: Commons Wikimedia, Periodic Trends(opens in new window) License: Public Domain) Other chemical properties include: Electropositive Character: Metals tend to have low ionization energies, and typically lose electrons (i.e.
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