In the modern periodic table which one of the following does not have an appropriate position?
A
Transition elements
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B
Inert gases
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C
Inner transition elements
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D
Halogens
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Solution
The correct option is C Inner transition elements The inner transition elements are two series of elements known as the lanthanoids (previously called lanthanides) and actinoids (previously called actinides). They are usually shown below all the other elements in the standard view of the periodic table, but they really belong to periods 6 and 7. The lanthanoid series consists of the 14 elements cerium through lutetium (atomic numbers 58,71), which immediately follow lanthanum. Likewise, the actinoid series consists of the 14 elements thorium through lawrencium (atomic numbers 90,103), which immediately follow actinium.