what are the group and period trends for electronegativity
Periodic trends 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.
Valence electron The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized. With the exception of groups 3â€“12 (the transition metals), the units digit of the group number identifies how many valence electrons are associated with a neutral atom of an element listed under that particular column.