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The elements in a horizontal row of the periodic table.

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Most Popular

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 the stage, with the illuminator below that.

Periodic Table

An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

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?

Valence Shell Electron Pair Repulsion Theory

Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Halogens

Group VIIA elements: F, Cl, Br, I

Viscosity

Resistance offered by the molecules of a liquid to flow is termed as viscosity.

Buret

A piece of volumetric glassware, usually graduated in 0.1-mL intervals, that is used to deliver solutions to be used in titrations in a quantitative (dropwise) manner.

Carcinogen

A substance capable of causing or producing cancer in mammals.

 

Binary Acid

A binary compound in which H is bonded to one or more of the more electronegative nonmetals.