No, only the K+ ion is possible; this is valid for all other alkali metals (group I)
Yes.
Yes, only if there are both ions with positive charges and ions with negative charges among the ionized atoms.
Yes.
There can be various amounts because molecules can form ionic bonds with other ions if they have opposite charges.
Metals form ions with charges of +1, +2, or +3. Those are the only options for metals.
C.The charges on the ions
C.The charges on the ions
Metals form positive ions and form ionic compounds with negative ions.
There are two possible options here: Iron and oxygen
Ions of opposite charges are involved in ionic bonding where the metal atoms form metallic bonds.
Opposite charge. Note that charged molecules are usually referred to as polyatomic ions. For example (NH4)2SO4 would be an example of two oppositely charged polyatomic ions.
No, it is not true that a neutral ionic compound can only contain ions with identical charges. You can have, for example, a compound that consists of twice as many positive ions as negative ions, but the positive ions have only half the charge; +1 ions bonded to -2 ions. There are many different possible ratios with which different elements or radicals combine. As long as the total amount of charge adds up to zero, you still have a neutral ionic compound.