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

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  • Harmful Chemicals Found In Food

    It's getting close to New Years and many people are starting to think about how to lose those extra pounds they managed to gain over the holidays. There are many sorts of diets and fads that have developed over the years from cutting carbs to cutting protein. Everyone has their own opinion as to...

  • 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...

  • 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.

  • 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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Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Meniscus

The shape assumed by the surface of a liquid in a cylindrical container.

Atom

The smallest particle of an element.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Charle's Law

At constant pressure the volume occupied by a definite mass of gas is directly proportional to its absolute temperature.

Insulator

Poor electric and heat conductor.

Equivalence Point

The point at which chemically equivalent amounts of reactants have reacted.

Reversible Reaction

Reactions that do not go to completion and occur in both the forward and reverse direction.

Lead Storage Battery

Secondary voltaic cell used in most automobiles.

Coordination Compound or Complex

A compound containing coordinate covalent bonds.