Compounds by definition are not elements at all and therefore cannot be metal elements.
If element X is a noble gas, it typically does not form ions because noble gases are generally unreactive and have a complete valence shell. However, if we consider element Z, which could be a metal or a non-metal that forms ionic compounds with X, its symbol for the ions in those compounds will depend on its oxidation state. For example, if Z is a metal like sodium (Na), the ion would be Na⁺. If Z is a non-metal like chlorine (Cl), the ion would be Cl⁻.
No, Mg is an element. No metals are compounds.
Calcium
Aluminum is an element (pure metal), not a compound.
Ionic compounds do not require the presence of a metal, for example ammonium chloride is ionic and does not contain a metallic element. What is true is that the majority of ionic compounds involve at least one metal.
Silver is an element, not a compound. There are no metals that are compounds.
Ionic compounds are usually formed between a metal element and a non metal element in most cases. There are some exceptions such as ammonium nitrate though.
Mercury is an element that is not made of other elements or compounds. It is a metal that exists in its pure form in nature.
Covalent
no, covalent compounds can only include non-metal elements and gold (Au) is a metal element
Sodium as an element is metal but as compounds with chlorine,florine,iodine etc they become salt compounds.
non metals . you change the ending of the non metal to "ide"