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Ruthenium is chemical element.
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It is fourth element to have unique magnetic properties (ferromagnetism) at room temperature.
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So far only three periodic table elements Iron (Fe), Cobalt (Co), and Nickel (Ni) have been found to be ferromagnetic at room temperature.
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It is rare transition metal belonging to platinum group of periodic table.
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Like other metals of platinum group, it is inert to most other chemicals.