An oxide of argon is not known and very probably is impossible.
No. Argon is chemically inert and does not form any bond with magnesium (or other metals).
ionic and covalent compound
Nearly all metals will form ionic compounds with oxygen, or 'oxides', as they are called.
No. There are several compounds of chlorine and oxygen, but all of them are molecular.
The difference in electronegativity between sulfur and oxygen is not sufficient to form ionic bonds.
ya lyk ether ketone
Yes: Each magnesium atom transfers its two valence electrons to an oxygen atom to form the ionic compound magnesium oxide.
no, they combine using covalent bonds
yes it will form an ionic compound.
Potassium will form ionic compound with group 17 elements (fluorine, chlorine, bromine, iodine) and group 16 elements (oxygen, sulphur, selenium).
calcium and lithium are both metals and dont form bond with each other. sodium and flourine form ionic compound, sodium fluoride. nitrogen and oxygen form covalent bond in the nitrogen oxides. helium and argon are both nonmetals / noble gases and dont form bond with each other.
Combination of a metal with a non metal will form an ionic compound.