Explanation:
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An ionic compound is composed of anions and cations. A cation is a positively charged ion, and an anion is the opposite. A metal is composed of two or more cations. Since you need at least one cation and one anion for an ionic compound, the metal is not ionic.
Steel because of friction. When rubber moves over smooth surfaces, it's the molecular forces between the two that are the main cause of friction. But when the surface is rough, it's the deformation of entire molecular layers of rubber that's the chief cause of friction.
Answer: Iodine and Nitrogen
Explanation:
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal.
Calcium (Ca) being a metal will donate electrons to form a cation called as . Thus it will bond ionically to non metals which can form anions.
Iodine can form and Nitrogen can form , thus forming and respectively.
Since the chemical formula is Al2O3, it means in a single molecule there are 2 atoms Al and 3 atoms O. O means oxygen and Al means alluminium, so there are 2 atoms alluminium and 3 atoms oxygen.