• Transition elements are the elements that are found in Groups 3-12 (old groups IIA-IIB) on the periodic table.
  • The term refers to the fact that the d sublevel, which is in the process of being filled, is in a lower principal energy level than the sublevel filled before it.
  • Because of this unique filling order, the transition elements are often referred to as “d-block” elements.
  • As a group, they display typical metallic properties and are less reactive than the metals in Groups 1 and 2.
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