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Voltaic cells that cannot be recharged, no further chemical reaction is possible once the reactants are consumed.

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  • 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...

  • Interesting facts about metals

    Metals have been used by people since ancient times. All the time the process of obtaining them was improved, useful alloys of various metals appeared. Let’s look at interesting facts about metals.

  • 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?



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Basic Anhydride

The oxide of a metal that reacts with water to form a base.

Extensive Property

A property that depends upon the amount of material in a sample.

Insoluble Compound

A very slightly soluble compound.

Electron Affinity

The amount of energy absorbed in the process in which an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a 1- charge, has a negative value if energy is released.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Capillary Action

The drawing of a liquid up the inside of a small-bore tube when adhesive forces exceed cohesive forces, or the depression of the surface of the liquid when cohesive forces exceed the adhesive forces.

Alkali Metals

Metals of Group IA (Na, K, Rb).

Electronegativity

A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom.

Atomic Number


Integral number of protons in the nucleus, defines the identity of element.
 

Electronic Transition

The transfer of an electron from one energy level to another.