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Vacuum A vacuum is a space that has no pressure and no molecules inside. It is truly and empty space. Although space has a very low pressure (almost a vacuum), there are still particles out there.

More Information: Matter
Valence Valence is a measure of how much an atom wants to form compounds with other elements. You may read of valence mechanism and valence number.

More Information: Ions
Valence Mechanism This mechanism is the way an atom bonds to other atoms to create stable (full) electron orbitals.

More Information: Ions
Valence Number The valence is the number of electrons that can form compounds with other atoms. The valence number for the same element can be different. Sulfur has the valence numbers 2, 4, and 6 depending on the type of compound it forms.

More Information: Ions
Vanadate Mineral A mineral that is made up of compounds with a vanadium oxide group or vanadium atom bonded to a metal. Vanadinite is a good example of a vanadate mineral.

More Information: Compounds
Vanadium Symbol:"V" Atomic Number:"23" Atomic Mass: 50.94amu. Vanadium is one of the transition elements. Vanadium can be found in some meteorites, crude oil, and many minerals.

More Information: Vanadium
Vapor A vapor is closely related to a gas. Scientists define a vapor as "a compound in a gaseous state when its temperature is below the critical temperature." Steam is considered to be a vapor because it is in a gas state but the temperature is still below the critical temperature. Steam is liquid water suspended in a gas state. Helium gas is a true gas at room temperature. You may also see the spelling "vapour."

More Information: Gases
Vapor Pressure A property that is unique to each liquid. When the surrounding pressure of a system is below the vapor pressure, the liquid is able to evaporate.

More Information: Gases
Vitreous Solid A vitreous solid has no specific organization of molecules. Steel is an example of a vitreous solid. Because of its combination of atoms, it does not have a specific melting point. It may become a liquid over a range of temperatures.

More Information: Solids
Volatile A volatile compound has a lower boiling point than surrounding compounds. Volatility is a comparison. Alcohol is more volatile than water because it evaporates at a lower temperature.

More Information: Liquids






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- Chem4Kids: Matter
- Chem4Kids: Atoms
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