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Answer: Mixture
Explanation:
If there is and unstable element composition of say, pure graphite an un-pure gold then a chemical reaction will most likely be used to separate the two elements.
Answer:
Two-element compounds are usually ionic when one element is a metal and the other is a non-metal.
Explanation:
sodium chloride: NaCl, with Na+ and Cl- ions
lithium nitride: Li3N, with Li+ and N3- ions
magnesium oxide: MgO, with Mg2+ and O2- ions
calcium phosphide: Ca3P2, with Ca2+ and P3- ions