The compound name for Pb2Se4 is lead(II) selenide. Lead is in the +2 oxidation state, indicated by the Roman numeral II, while selenide is the anion derived from selenium.
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The chemical symbol for the compound borax is Na2B4O7·10H2O.
The chemical formula for lead iodide is PbI2.
The correct order is to write the metal ion first followed by the non-metal ion. For example, sodium chloride or calcium carbonate.
Copper is an element with the chemical symbol Cu and atomic number 29. It is a pure substance made up of copper atoms and is not a compound, which is a substance made of two or more elements chemically bonded together.
Petrol is a mixture of organic compounds. These organic compounds have covalent bonds.