Question

compounds consist of atoms are not created or destroyed in a chemical reaction. 12. formulas of compounds a compound is represented by a chemical formula in which the kind and number of atoms present is shown by using the element symbols and subscripts example: the simple sugar, glucose c6h12o6 means there a 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atom 13. rules for writing formulas a. each atom present is represented by its element b.the number of each type of atom is indicated by a written to the right of the element c. when only one atom of a given type is present, the subscript 1 is written.

Explanation:

13a. In chemical formulas, each atom is represented by its element symbol.
13b. The number of each atom type is shown by a subscript to the right of the element symbol.
13c. When there is only one atom of a type, the subscript 1 is not written.

Answer:

13a. symbol
13b. subscript; symbol
13c. not