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Section: 2.2 Date: Essential Questions Periodic Trends Atomic Radius Periodic Trends What are the trends that occur in the periodic table by organizing elements by their atomic number? Periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of a certain element. Periodic trends, arising from the arrangement of the periodic table, provide chemists with a tool to quickly predict an element’s properties. These trends exist because of the similar atomic structure of the elements within their group families or periods, and because of the periodic nature of the elements. The atomic radius is one-half the distance between the nuclei of two atoms. Which has a greater atomic radius: Al or Ca? Electronegativity Which is greater: Sc or Ni? Electronegativity is a chemical property describing an atom’s ability to attract and bind with electrons. It measures an atom’s tendency to attract and form bonds with electrons. First Ionization Energy Ionization energy is the energy required to remove an electron from a neutral atom in its gaseous phase. Electron affinity is the ability of an atom to accept an electron. Which is greater: Ge or I? Electron Affinity Which is greater: H or Zn? Reactivity Which is greater: Zn or Au? Br or O? Reactivity refers to how likely an atom is to react with other substance. Metals and Nonmetal have different trends.