Open Question
Classify each element as a representative element, transition metal, or inner‑transition metal.
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
Multiple Choice
Which of the following elements is classified as an inner transition element?
A
Sodium (Na)
B
Chlorine (Cl)
C
Uranium (U)
D
Iron (Fe)
Verified step by step guidance1
Understand the classification of elements in the periodic table: Inner transition elements are those found in the f-block, which includes the lanthanides and actinides series.
Identify the position of each element in the periodic table: Sodium (Na) is an alkali metal in the s-block, Chlorine (Cl) is a halogen in the p-block, Iron (Fe) is a transition metal in the d-block, and Uranium (U) is an actinide in the f-block.
Recall that inner transition elements are specifically the lanthanides and actinides, which are located below the main body of the periodic table and involve filling of f-orbitals.
Recognize that Uranium (U) belongs to the actinide series, making it an inner transition element, while the others do not fit this category.
Conclude that Uranium (U) is classified as an inner transition element because it is part of the f-block elements.
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