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discovery year of group 7 elements

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group 7 elements | discovery year
group 7 elements | discovery year

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manganese | 1774 technetium | 1937 rhenium | 1925 bohrium | 1981
manganese | 1774 technetium | 1937 rhenium | 1925 bohrium | 1981
group 7 elements | discovery year | {1774, 1937, 1925, 1981} (median)
group 7 elements | discovery year | {1774, 1937, 1925, 1981} (median)

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