Mg(NO3)2 {note correct case for "O"} is not an element at all. Instead it is a compound of three elements, magnesium, nitrogen, and oxygen.
The compound name for Mg(NO3)2 is magnesium nitrate.
Since Mg(NO3)2 dissociates into Mg^2+ ions and NO3^- ions in solution, the concentration of nitrate ions in a 0.25 M Mg(NO3)2 solution will also be 0.25 M.
It is an element. Elements are composed of atoms, and atoms of elements combine chemically to form compounds.
This chemical element is dysprosium (Dy).
The element name for element number 31 is Gallium.
The compound name for Mg(NO3)2 is magnesium nitrate.
This is a 'Sngle Displacement' reaction ( A + BC --> AC + B
Mg(NO3)2 is soluble in water because nitrate (NO3-) salts are generally soluble, including magnesium nitrate.
Since Mg(NO3)2 dissociates into Mg^2+ ions and NO3^- ions in solution, the concentration of nitrate ions in a 0.25 M Mg(NO3)2 solution will also be 0.25 M.
Since you already have the chemical formula of the compound, it is not difficult to make up what elements it is made up from. The elements are magnesium (Mg), nitrogen (N) and oxygen (O). The hard part comes when you are given a more unfamiliar chemical name like tetrachloromethane, names like limestone and trade names.
It is an element.
Metal is not an element. It is a term used to classify an element, but it is not an element.
It is an element. Elements are composed of atoms, and atoms of elements combine chemically to form compounds.
element. Sulfur dioxide (SO2) is a compound
If you meant "element" as in a chemical element, there is no element with the symbol "ef" in the periodic table.
There is no such thing as a good element or a bad element.
Neon is an element.