What are the spectator in 2H^ + +SO 4 ^ 2 +Co^ 2+ +2l CoSO 4 +2H^ 4 +21

the answer is:  

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl