1 Answer. Transition metals like iron, nickel and cobalt are known for producing a magnetic field. Most transition metals have 2 valence electrons. Increasing Atomic Number. As. The 38 elements in groups 3 through 12 of the periodic table are called "transition metals". Most transition metals have an electron configuration that is ns^2 (n-1)d, so those ns^2 electrons are the valence electrons. There are a number of elements that are classified as transition metals. For example, group 16 is also described as the "oxygen group" and as the "chalcogens". • Odd electron metals attain 18 valence electrons through formation of M −M (Mn) bonds or through reduction. They make up the largest section of the periodic table located at the center of the table including columns 3 through 12. All transition metals are placed under the d-block from group number 3 to 12. These metals are found in the earth's crust and ores of minerals. Im revising electrons and shells and stuff for chemistry at the moment and I'm not really sure why the transition metals don't have a group number because transition metals must have outer shells too? Answer Save. Valence electrons are the sum total of all the electrons in the highest energy level (principal quantum number n). In regards to atomic size of transition metals… For example. Transition metals show characteristics like malleability, ductility and are good conductor of electricity. The transition metals form similar compounds [such as FeCl 3, HgI 2, or Cd(OH) 2], but they are more likely than main group metals to form complexes, such as the FeCl 4-, HgI 4 2-, and Cd(OH) 4 2-ions, that have an excess number of negative ions. I'm really confused :/ Can someone explain it to me simply please? The transition metals are a group of elements in the periodic table. Inner Transition Metals B) Transition Metals C) Group B elements D) Group A elements. • First row transition metal carbonyls mostly obey the 18VE rule: • Each metal contributes the same number of electrons as its group number. Groups may also be identified using their topmost element, or have a specific name. The post-transition metals are aluminum (Al), gallium (Ga), indium (In), thallium (Tl), tin (Sn), lead (Pb) and bismuth (Bi), and they span Group 13 to Group 17. Disagreements mostly involve elements number 1 and 2 (hydrogen and helium), as well as inner transition metals. However, the Group 12 metals have much lower melting and boiling points since their full d subshells prevent d–d bonding. What elements are transition metals? Which of the following elements is a metalloid... A) As B) Se C) Br D) Kr. 5s orbital. The transition elements or transition metals occupy the short columns in the center of the periodic table, between Group 2A and Group 3A. 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