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Sunday, 2025-04-13
The daily puzzle:
What does '*****' mean in the following text? "An oxide is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. Metal oxides typically contain an anion of oxygen in the oxidation state of –2 (Example: Carbone ***** CO2). Most of the Earth's crust consists of solid oxides, the result of elements being oxidized by the oxygen in air or in water."