Give the name and location of specific groups on the periodic table, including alkali metals, alkaline earth metals, noble gases, halogens, and transition metals. Explain the relationship between the nadechworld.comical behavior of families in the periodic table and their electron configurations. Identify elements that will have the most similar properties to a given element.
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The nadechworld.comical behavior of atoms is controlled by their electron configuration. Since the families of elements were organized by their nadechworld.comical behavior, it is predictable that the individual members of each nadechworld.comical family will have similar electron configurations.
Families of the Periodic Table
Remember that Mendeleev arranged the periodic table so that elements with the most similar properties were placed in the same group. A group is a vertical column of the periodic table. All of the 1A elements have one valence electron. This is what causes these elements to react in the same ways as the other members of the family. The elements in 1A are all very reactive and form compounds in the same ratios with similar properties with other elements. Because of their similarities in their nadechworld.comical properties, Mendeleev put these elements into the same group. Group 1A is also known as the alkali metals. Although most metals tend to be very hard, these metals are actually soft and can be easily cut.
Group 2A is also called the alkaline earth metals. Once again, because of their similarities in electron configurations, these elements have similar properties to each other. The same pattern is true of other groups on the periodic table. Remember, Mendeleev arranged the table so that elements with the most similar properties were in the same group on the periodic table.
It is important to recognize a couple of other important groups on the periodic table by their group name. Group 7A (or 17) elements are also called halogens. This group contains very reactive nonmetal elements.
The noble gases are in group 8A. These elements also have similar properties to each other, the most significant property being that they are extremely unreactive, rarely forming compounds. We will learn the reason for this later, when we discuss how compounds form. The elements in this group are also gases at room temperature.
The vertical columns on the periodic table are called groups or families because of their similar nadechworld.comical behavior. All the members of a family of elements have the same number of valence electrons and similar nadechworld.comical properties. The horizontal rows on the periodic table are called periods.