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The international union of pure and appl...

The international union of pure and applied chemistry (IUPAC) has adopted a new version of modern periodic table known as long form of periodic table. The long form of periodic table was constructed by Bohr in 1920. The classification of elements in the long form of periodic table is based on electronic configuration of elements. The horizontal rows are called periods and vertical columns are called groups. The first period consists of 2 elements. The subsequent period consists of 8, 8, 18, 18 and 32 elements respectively. The 7th period is incomplete and 6th period have maximum of 32 elements. The groups are numbered 1 to 18 from left to right in the periodic table.
In Mendeleev's periodic table, mercury belongs to IIB group. The group to which mercury belongs in long form of periodic table is

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C
`12^(th)`
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