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discovery year of group 4 elements

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group 4 elements | discovery year
group 4 elements | discovery year

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titanium | 1791 zirconium | 1789 hafnium | 1923 rutherfordium | 1964
titanium | 1791 zirconium | 1789 hafnium | 1923 rutherfordium | 1964
group 4 elements | discovery year | {1791, 1789, 1923, 1964} (median)
group 4 elements | discovery year | {1791, 1789, 1923, 1964} (median)

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