Yes you do cause its more explanation to
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Flammable liquid,gasoline, oil, and etc
Answer:

Explanation:
The atomic number (Z) of copper is 29 and this isotope has an atomic mass (A) of 70.
The general symbol for an isotope E is
.
The atomic number is a left subscript, and the atomic mass is a left superscript.

Answer:
I'm not completely sure but possibly (HCO³)