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A vertical column in the periodic table, also called a family.

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Weak Field Ligand

A Ligand that exerts a weak crystal or ligand field and ge- nerally forms high spin complexes with metals.

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Crystal Field Theory

Theory of bonding in transition metal complexes in which ligands and metal ions are treated as point charges, a purely ionic model, ligand point charges represent the crystal (electrical) field perturbing the metal?s d orbitals containing nonbonding electrons.

Thermodynamics

The study of the energy transfers accompanying physical and chemical processes.

Solute

The dispersed (dissolved) phase of a solution.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Coke

An impure form of carbon obtained by destructive distillation of coal or petroleum.

Corrosion

Oxidation of metals in the presence of air and moisture.

Vapor Pressure

The particle pressure of a vapor at the surface of its parent liquid.

How to make crystal glass

From history we know that the idea of creating crystal belongs to the British: they were the first to add lead oxides to the charge material, and as a result got glass with unusual “voice”, transparency and sparkling faces. Classical crystal contains 24% of lead oxide, but there are products with a higher content of up to 30%.