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Answer:
An Element is a substance made up of only one type of atom as like gold, copper, oxygen, etc.
Copper sulphate with molecular formula , the elements are copper, sulphur and oxygen. It is formed by combination of cation and anion.
Copper sulphide with molecular formula , the elements are copper and sulphur. It is formed by combination of cation and anion.
Ionic bonds usually occur between metal and nonmetal ions. For example, sodium (Na), a metal, and chloride (Cl), a nonmetal, form an ionic bond to make NaCl. In a covalent bond, the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals.