Mercury(I) oxide
Encyclopedia
Mercury oxide, also known as mercurous oxide or oxomercury, is an inorganic metal oxide with the chemical formula Hg2O.

It is a brown/black powder, insoluble in water, toxic but without taste or smell. It is chemically unstable and converts to mercuric oxide and mercury
Mercury (element)
Mercury is a chemical element with the symbol Hg and atomic number 80. It is also known as quicksilver or hydrargyrum...

metal.
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