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Representation of the core of a molecule, ion or formula unit by showing atomic symbols and only outer shell electrons.

Latest Articles

  • Gas of rotten eggs

    If you happen to break a rotten egg, then you know the smell of hydrogen sulfide, because the stench of the spoiled egg depends on of its presence in rotting protein substances.

  • Why do copper products change color, and what is the name of the process?

    Probably, every person wants to know, why over time the copper turns green and becomes bloomed. This is easy to explain: that film is called patina.

  • Diamonds Are Forever

    Diamonds are still a girl's best friend, right? We love the shiny gems. They are the most popular rocks sold today. But what exactly are they, anyway? Where do they come from? What else are they used for?

  • The most expensive metal in the world

    Do you think the most expensive metal is gold? No! On earth there are more valuable metals. But we need to divide the value of metals that occur in nature, and metals - isotopes, which are obtained in special laboratories. Let’s look at natural metals first.

  • Varieties of garnet minerals

    The most famous type of garnet stone is pyrope (flaming). This is the "oldest of garnets", with a dense red color, similar to the grain of an edible garnet. Pyrope has a variety called rhodolite - a stone of dense pink or pink-purple color, which sometimes has the alexandrite effect and is used in...



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Donor Atom

A ligand atom whose electrons are shared with a Lewis acid.

Amine Complexes

Complex species that contain ammonia molecules bonded to metal ions.

Condensed Phases

The liquid and solid phases, phases in which particles interact strongly.

Secondary Standard

A solution that has been titrated against a primary standard. A standard solution is a secondary standard.

 

Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

Saponification

Hydrolysis of esters in the presence of strong soluable bases.

Radiation

High energy particles or rays emitted during the nuclear decay processes.

Covalent Bond

Chemical bond formed by the sharing of one or more electron pairs between two atoms.

Exothermic

Describes processes that release heat energy.

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.