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Fine divided solid particles suspended in polluted air.

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  • 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...

  • 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.

  • 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.

  • Use of diamonds

    Diamond is a crystalline modification of pure carbon formed in the deep interior of the Earth, in the upper mantle at depths of more than 80-100 kilometers, at exceptionally high pressure and temperature. It is the most precious stone, the hardest and most wear-resistant mineral, the most...

  • Features of the Scanning Tunneling Microscope

    The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types. The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The...



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Frequency

The number of repeating corresponding points on a wave that pass a given observation point per unit time.

Periodicity

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

Raoult's Law

The vapor pressure of a solvent in an ideal solution decreases as its mole fraction decreases.

Daughter Nuclide

Nuclide that is produced in a nuclear decay.

 

Square Planar Complex

Complex in which the metal is in the center of a square plane, with ligand donor atoms at each of the four corners.

Period

The elements in a horizontal row of the periodic table.

Cation

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

Electron

A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

Net Ionic Equation

Equation that results from canceling spectator ions and eliminating brackets from a total ionic equation.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.