Question

100 points! Formation of an Ion

Aluminum is one of the most common elements in Earth's crust, yet it is never found as a pure element in nature. That is, aluminum atoms are always combined with atoms of other elements, such as oxygen. An aluminum oxide compound you will recognize by its name is the gemstone called "ruby". Its chemical formula is

Al2O3

If every oxygen ion (combined with an aluminum ion) has a charge of -2, what must the charge of each aluminum ion be? How can you tell this? Also, what has to happen to an uncharged aluminum atom so that it will bond with oxygen?

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Answer 1

Given the chemical formula Al2O3 and every oxygen ion (combined with an aluminum ion) has a charge of -2, the total negative charge is -2x3 = -6.

As Al2O3 is neutral, the total positive charge must be 6. The charge of each aluminum ion is 6/2 = 3.

An uncharged aluminum atom must lose 3 electrons so that it will bond with oxygen.

Answer 2

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Aluminum ions have a charge of +3. This means that the atoms have three more protons than electrons. In order to add electrons to aluminum ions, the purification process therefore requires a large amount of electricity.

Uncharged Aluminum atom must need to lose it's electrons,in order to form the bond with oxygen which has vacant orbitals

ion
atom that has a positive or negative charge because it lost or gained one or more electrons

chemical bond
the attractive force that holds atoms or ions together

ionic bond
a chemical bond in which one atom loses an electron and the other atom gains electrons to form ions

chemical formula
a combination of chemical symbols and numbers to represent a substance

covalent bond
bond formed by the sharing of electrons between atoms

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