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

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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.

  • Ozone

    We breathe 24 hours a day, 7 days a week, consuming about 25 kg of air every day. It turns out that we practically predetermine our health by the air we breathe.

  • What are Compound Microscopes?

    Most of the microscopes used today are compound. A compound microscope features two or more lenses. A hollow cylinder called the tube connects the two lenses. The top lens, the one people look through, is called the eyepiece. The bottom lens is known as the objective lens. Below the two lenses is...

  • 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.



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Sigma Bonds

Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

Leclanche Cell

A common type of dry cell.

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Miscibility

The ability of one liquid to mix with (dissolve in) another liquid.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Cation

A positive ion, an atom or group of atoms that has lost one or more electrons.

Ligand

A Lewis base in a coordination compound.

Energy

The capacity to do work or transfer heat.

Film badge

A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.

Alums

Hydrated sulfates of the general formula M+M3+(SO4)2.12H2).