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The atomic number of the element which is
not included in the main body of the period
table

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answer is C.

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Detailed Solution

The first two columns on the left hand side and six columns on the right hand side of the periodic table are called main group of elements or main body of the periodic table. They include transition elements.

68 is the atomic number of the element erbium which belongs to the f-block, 6th period which is a part of the main body.

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