PLEASE HELP how do chemical formulas help identify substances and determine the number of atoms of each element in chemical formulas containing subscripts

In a chemical formula, the symbols for each element in the compound are followed by subscripts that tell us how many of that element are in the compound. The subscripts that follow each element's symbol indicate how many of that element are in the compound.

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plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.