Text and images Copyright (c) 2010 by Theodore W. Other categories are possible, depending on the criteria for inclusion. The others are soft metals that react violently with water to release hydrogen gas, which either bubbles off or spontaneously ignites depending on how far down you are on the table.Ĭlick any element below to see all the samples of that element. The Metallic elements table in this section categorises the elemental metals on the basis of their chemical properties into alkali and alkaline earth metals transition and post-transition metals and lanthanides and actinides. Hydrogen is an anomaly: It's traditional to put it in this column, but it really has very little in common with the rest. As a rule, you wouldn't want any around the house in pure form, though as a compound they can be quite tasty. The Alkali Metals comprise the left-most column of the periodic table. They are generally very stable chemically and exhibit similar properties of being colorless and odorless.The collection Alkali Metals in the Periodic Table H They generally very chemically reactive and are present in the environment as compounds rather than as pure elements. They comprise group 17 of the periodic table, from F through At. The halogen elements are a subset of the nonmetals. The term "nonmetals" is used to classify the elements H, C, N, P, O, S, and Se. Only thorium and uranium are naturally occurring actinides with significant abundance. They, along with the lanthanides, are often called "the f-elements" because they have valence electrons in the f shell. The actinides comprise elements 89 through 103. They, along with the actinides, are often called "the f-elements" because they have valence electrons in the f shell. They are grouped together because they have similar chemical properties. This makes the former less reactive than the latter 11. Alkaline earth metals have two valence electron, whereas alkali metals have just one. The lanthanides comprise elements 57 (lanthanum, hence the name of the set) through 71. The alkali and alkaline earth metals do have some similar physical properties, but the main difference between the two is the number of valence electron. They sometimes behave as semiconductors (B, Si, Ge) rather than as conductors. The metalloids are B, Si, Ge, As, Sb, Te, and Po. Metalloid (or "semi-metal" or "poor metal").They tend to be softer and conduct more poorly than the transition metals. As their name implies, they have some of the characteristics of the transition elements. The post-transition elements are Al, Ga, In, Tl, Sn, Pb and Bi. The transition elements are metals that have a partially filled d subshell (CRC Handbook of Chemistry and Physics) and comprise groups 3 through 12 and the lanthanides and actinides (see below). Their characteristics are well described and consistent down the group. The alkaline earth metals have very high melting points and oxides that have basic alkaline solutions. Representative metals are members of s block and parts of p block of the table Elements of group 1, (except hydrogen) 2, 13, (except boron) tin and lead of group 14, and. ![]() ![]() The alkaline earth metals make up group 2 of the periodic table, from Be through Ra. The outer electron shell is not filled for these elements, giving them a valence. The representative elements are groups 1 and 2 and group 13-17 on the periodic table. Another name for the representative elements is the main group elements. Hydrogen is group 1 but exhibits few characteristics of a metal and is often categorized with the nonmetals. In chemistry, the representative elements are the elements with atoms filling s and p electron orbitals. They have very similar behavior and characteristics. The alkali metals make up group 1 of the Table, and comprise Li through Fr. Alkaline earth metals are the elements in the group 2. In our version of the table, we have chosen the most commonly accepted demarcations between these elements. Alkali metals are the elements in the group 1 of the periodic table. For example, in some tables, Group 12 is is categorized with the post-transition metals, and in others, aluminum and tin are included characterized as Metalloids or poor metals. The dividing line between metals and non-metals is not hard and fast, thus the distinction between "Post-transition metals" and "Metalloids" is represented differently on different versions of the Periodic Table. Metal elements are usually good conductors of both electricity and heat. Elements can generally be described as either metals or nonmetals.
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