Solder comes in various sorts - lead-free, brass, silver, and probably others.
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The compound symbol for solder can vary depending on the specific composition. Common solder compounds include tin-lead solder (Sn-Pb) and lead-free solder such as tin-silver-copper (Sn-Ag-Cu) or tin-copper (Sn-Cu).
It is a mixture
Hydrogen carbonate is a compound, not an element, and it therefore has a formula, not a symbol: H2CO3.
Ag is the chemical symbol for silver, which is an element. It is not a compound.
The subscript 4 should be written to the right of the symbol for fluorine in the compound dinitrogen tetrafluoride, which is N2F4.
Hl is an element. It is the chemical symbol for the element helium on the periodic table.