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Al 3+ Aluminum ion PowerPoint PPT Presentation


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Al Aluminum is an element. It is a metal with a neutral charge. However, it is not stable. In order to be stable it must give away its 3 valence electrons. When it does this, it becomes.

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Al 3+ Aluminum ion

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Al 3 aluminum ion

Al

Aluminum is an element. It is a metal with a neutral charge. However, it is not stable. In order to be stable it must give away its 3 valence electrons. When it does this, it becomes

When aluminum loses 3 electrons (each electron has a negative charge), it becomes a positively-charged ion

Al 3+

Aluminum ion


Al 3 aluminum ion

Superscript: Indicates that the aluminum ion has a charge of 3+

Superscript: Indicates that the sulfate ion has a charge of 2-

The positively charged aluminum cation can only form when it can give away its electrons to another element or compound that needs those electrons to become stable – like the sulfate ion. Together, they form:

SO42-

Sulfate ion

(POLYATOMIC = many atoms)

Al 3+

Aluminum ion

Al2(SO4)3

Aluminum sulfateis NEUTRAL (no charge). The charges of each individual ion in the compound are used to determine how many of each ion are needed to make the compound NEUTRAL (no charge = 0)


Al 3 aluminum ion

Symbols in parentheses: Indicates that the polyatomic ion SO3 is present in Al2(SO4)3

Coefficient: Indicates that there are a total of two 2 Al2(SO4)3

2 Al2(SO4)3

Symbol: Indicates that aluminum is present in Al2(SO4)3

Subscript outside parentheses: Indicates that there are a total of three (3) SO3 ions present in each Al2(SO4)3

Subscript: Indicates that there are a total of four (4) oxygen atoms present in each SO4ion

Subscript: Indicates that there are a total of two (2) aluminum ions present in each Al2(SO4)3


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