Group (IIIA) Elements and Aluminum Chemistry

Comprehensive vocabulary flashcards covering the properties, extraction, alloys, and compounds of Group (IIIA) elements and Aluminum.

Group (IIIA) Elements

A group consisting of Boron ($B$), Aluminum ($Al$), Gallium ($Ga$), Indium ($In$), and Thallium ($Ti$) which all contain three electrons in their outer shell.

Group (IIIA) Metalloid

Boron ($B$), which is the only element in the group categorized as a metalloid while the others are metals.

Ionization Energy Trend

The ionization energy of Group (IIIA) is less than Group (IIA) because (IIIA) elements have one electron in an unsaturated secondary shell ($np^1$), while (IIA) has a saturated shell ($ns^2$).

Group (IIIA) Oxidation Number

The common oxidation number for these atoms is $(+3)$, and they tend to form covalent bonds.

Bauxite

The main source of Aluminum extraction, consisting of aqueous aluminum oxide with the formula $Al_2O_3 \times 2H_2O$.

Cryolite

A fluoride of sodium and Aluminum ($Na_3AlF_6$) used in the extraction process to decrease the melting point of Alumina.

Hall Process

The major industrial process for Aluminum extraction involving the electrolysis of Alumina melted in molten Cryolite.

Alumina

Pure Aluminum oxide ($Al_2O_3$) obtained by chemically purifying Bauxite to exclude impurities.

Aluminum Corrosion Resistance

A property caused by the formation of a thin, firm layer of oxide on the surface when exposed to air, preventing further oxidation.

Thermite Process

A vigorous reaction between Aluminum powder and iron (III) oxide ($Fe_2O_3$) that releases great heat, sparks, and molten iron, used for welding.

Amphoteric Behavior

The ability of Aluminum to react with both acids and bases to release hydrogen gas and form salts.

Nitric Acid ($HNO_3$) Storage

Aluminum containers are used for this acid because the reaction stops once a layer of Aluminum oxide ($Al_2O_3$) isolates the metal.

Duralumin Alloy

An alloy composed of a high percentage of Aluminum and small amounts of copper and magnesium; it is characterized as light and hard, making it ideal for aircraft parts.

Aluminum Bronze Alloy

An alloy containing a small percentage of Aluminum and a high ratio of copper; it resists erosion and is used for decoration as its color varies from copper to gold or silver.

Aluminum Hydroxide ($Al(OH)_3$)

A white gelatinous material insoluble in water, prepared by reacting an aqueous aluminum salt solution with sodium or potassium hydroxide.

Alum (Potassium Alum)

A double salt of potassium sulphate and aluminum sulphate with the general formula $[ KAl(SO_4)_2 \times 12H_2O ]$.

Testing for Aluminum Ion ($Al^{+3}$)

Measured by reacting the ion with a basic solution like $NaOH$ to form a characteristic white gelatinous deposit of Aluminum hydroxide.