It is the valence electrons that are the ones that react and combine in bonds in chemistry
Ammonia is not an element and therefore does not have either a symbol or valency. Instead it has the chemical formula NH3.
Symbol: Cl-Valency: -1.
Symbol for sodium cation is 'Na(+)' Its valency is '1'.
The symbol for nitrate is NO3-. The valency of nitrate is -1.
The chemical symbol for gold is Au, and its valency is typically +1 or +3.
AgBr is the chemical formula (not symbol) of silver bromide.
NiS .simple just take H2S so s has valency 2.we know nickel has valency 2(i hope you did) so formula is NiS
Zinc has a valency of 2. It is represented by the symbol Zn.
The symbol for mercury is Hg and it has a valency of 1 or 2, depending on the compound it is in. In most cases, mercury exhibits a valency of 2.
The symbol of Silver is Argentum or Ag and valency is positive 3
The symbol for fluoride is F. Fluoride has a valency of -1, meaning it typically gains one electron to achieve a stable electron configuration.
It is the element symbol O which represents oxygen.