Solder comes in various sorts - lead-free, brass, silver, and probably others.
It is a mixture
Hydrogen carbonate is a compound, not an element, and it therefore has a formula, not a symbol: H2CO3.
Perchlorate, being an ionic compound, does not have a chemical symbol, per say. The chemical notation is ClO4-, if that is what you were asking.
Depends on the kind of solder.
i wanna know what symbol represents nicotine?
Solder is a metallic alloy
yes
It is a mixture
The symbol for nicotine (a compound) is C10H14N2.
A monovalent cation; the symbol is I (Roman).
NaOH
Symbol
This is an alloy, not ionic or covalent.
Helium (He) is a chemical element, not a compound; the chemical symbol is He.
The compound element of wood is carbon. Its symbol is C
It represents the composition of a compound
There is no symbol for Al2O3 as it is a compound, chemical symbols are for elements