<Table> <Tr> <Td> </Td> <Td> This article's tone or style may not reflect the encyclopedic tone used on Wikipedia . See Wikipedia's guide to writing better articles for suggestions . (November 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article's tone or style may not reflect the encyclopedic tone used on Wikipedia . See Wikipedia's guide to writing better articles for suggestions . (November 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> Periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of a certain element, including its radius and its electronic properties . Major periodic trends include: electronegativity, ionization energy, electron affinity, atomic radius, melting point, boiling point, metallic character, ionic radius and reactivity . Periodic trends arise from the arrangement of elements in the periodic table and allow chemists to quickly and reliably predict an element's properties . These trends exist because of the similar atomic structure of the elements within their respective group families or periods, and because of the periodic nature of the elements . There are exceptions to these trends, such as that of ionization energy in Groups 3 and 6 . </P> <P> These periodic trends are based on the Periodic Law which states that if the chemical elements are listed in order of increasing atomic number, many of their properties go through cyclical changes, with elements of similar properties recurring at intervals . For example, after arranging elements in their increasing atomic numbers, many of the physical and chemical properties of Lithium are recurred into Sodium such as its vigorous reactivity with water, which again recurs in the next cycle starting with Potassium . </P>

What are the group and period trends for electronegativity
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