You need to use the Periodic Table of Elements to solve this problem.
In chemistry, all the elements have their own symbols for simplicity.
Co is the short form for Cobalt. Cobalt is an element (denoted by the red arrow) with the atomic number 27 or (the number of protons). An element is a substance whose atoms all have the same number of protons.
The symbol CO stands for carbon monoxide, but the symbol Co stands for the element cobalt. Explain.
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