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. Period - reactivity increases as you go from the left to the right. The most reactive nonmetals reside in the upper right portion of the periodic table. Group - reactivity increases as you go down a group. Elements on the left of the Periodic Table are highly electropositive and form ionic hydrides, while those of the center and right are covalent in. The properties of main group hydrides are dependant on the difference in electronegativity between the element and hydrogen (Table 1.10.1 1.10. ![]() Nonmetals tend to gain electrons in chemical reactions, and have a high attraction for electrons within a compound. Periodic trends for the main group hydrides. 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. ![]() They were discovered by the Russian chemist Dmitri Mendeleev in 1863. This activity offers students a model or reference to compare the periodic table to while learning about it and its uses. In chemistry, periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of certain elements when grouped by period and/or 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. Elements in the same group of the periodic table show trends in physical properties. I also present this material in greater depth, directly looking at the periodic table and its trends such as ionization energy, atomic radius, reactivity, etc. On the other hand, the elements on right side of the. The elements on the left side of the periodic table have less ionisation energy and readily loose their valence electrons. (Credit: User:Mirek2/Wikimedia Commons Source: Commons Wikimedia, Periodic Trends(opens in new window) License: Public Domain) Periodic Trends and Chemical Reactivity: The physical and chemical properties of elements depend on the valence shell electronic configuration as discussed earlier.
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