There is no element that has the formula A1. There is aluminum, which as the chemical formula Al. The ion that typically comes from it is Al3+.
Because it has 3 valence electrons. The same reason any element is in the group it is in.
Compound known as chloride contain the element chlorine, typically in the form of the chloride ion.
Helium is typically monatomic, even as an ion.
Mainly Silver(I) or Ag+ ion. It can also form Silver(II) or Ag2+ ion.
A sulfide ion is an ion of just the sulfur atom on its own, whereas a sulfate ion is an ion that is composed of sulfur and oxygen, typically SO42-.
Because it has 3 valence electrons. The same reason any element is in the group it is in.
Iodine typically gains an electron to form a -1 ion.
metals and non-metals
Compound known as chloride contain the element chlorine, typically in the form of the chloride ion.
A-B-A1
Helium is typically monatomic, even as an ion.
Tellurium typically forms a 2- ion.
Phosphorus will form the phosphide (P3-) ion.
Mainly Silver(I) or Ag+ ion. It can also form Silver(II) or Ag2+ ion.
No. Sulfur can form an S2+ ion.
A sulfide ion is an ion of just the sulfur atom on its own, whereas a sulfate ion is an ion that is composed of sulfur and oxygen, typically SO42-.
Fluoride Ion