Answer:
• Formula: ,Co,, Name: ,Cobalt,.
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• Formula: ,C,, Name: ,Carbon,.
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• Formula: ,Fe,, Name:, Iron,.
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• Formula: ,Au,, Name: ,Gold,.
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• Formula: ,KCl,, Name: ,Potassium chloride,.
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• Formula: ,CS2,, Name: ,Carbon disulfide,.
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• Formula: ,Si,, Name: ,Silicon,.
Step-by-step explanation:
• Co is an element.
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• Carbon is an element.
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• Iron is an element.
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• Au is an element.
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• KCl is a compound with K and Cl. The name has the positive part first (Potassium) and the second part has the name of the negative part (chloride).
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• CS2 is a compound with C and 2 S. The name has the number of each element, carbon is 1 so it is just Carbon, and there are 2 sulfurs (disulfide).
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• Silicon is an element.