The 7 horizontal rows are called periods the families

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Unformatted text preview: l rows are called periods. The families are identified as 2 specific groups, A or B. The "A" group of elements are also known as representative elements. These elements exhibit a wide variety of chemical and physical properties. The "B" group of elements are also know as transition elements and often have more than one combining charge. The sequence of charge is the same in all the periods and this led to the creation of the Periodic Law which states that: "When the elements are arranged in order of increasing atomic number, there is a periodic pattern in their physical and chemical properties." 12.3 Electron Configuration and Periodicity Of the 3 subatomic particles the electron plays the greatest role in the physical and chemical properties of the elements. There is a direct relationship between the similarity of properties of the elements and their electron configuration(the placement of electrons around the nucleus). How to get the electron configuration of an element The electron structure around an atom is based on the fact that in nature everything seeks the lowest possible energy because this is the most stable...
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