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26.

Wavelength Å

222.

This box is used to specify the equivalent mass of the solute. This is required only only if concentration in terms of normality is involved.
Normality = Number of Equivalents / liter of solution

560.

Through chemical composition and physical attributes, homogeneous portion of matter that separated from its environment in its expansion through a surface.

562.

Expressed through standard deviation: Values given over accidental errors.

564.

Values given over accidental errors.

604.

A nuclear isomer is a metastable or isomeric state of an atom caused by the excitation of a proton or neutron in its nucleus so that it requires a change in spin before it can release its extra energy. They decay to lower energy states of the nuclide through two isomeric transitions:[br] -> γ- emission (emission of a high-energy photon)[br] -> internal conversion (the energy is used to ionize the atom)[br] Contrast this with the definition of a chemical isomer, the more common use of the word. Also contrast with the meaning of isotope, in which the difference is the number of neutrons in the nucleus. Metastable isomers of a particular atom are usually designated with an "m" (or, in the case of atoms with more than one isomer, 2m, 3m, and so on). This designation is usually placed after the atomic symbol and number of the atom (e.g., Co-58m), but is sometimes placed as a superscript before (e.g., [sup]m[/sup]Co-58 or [sup]58m[/sup]Co).

613.

The Ionic Radius is the radius of a charged atom, known as an ion. The ion can have a positive or a negative charge. The charge of the ion with the radius shown is also displayed in Kalzium. A positive ion has fewer electrons in its shell than the atom, a negative ion has more electrons. Therefore, a positive ion has a smaller radius than its atom and vice versa.

614.

The van der Waals radius of an atom is the radius of an imaginary hard sphere which can be used to model the atom for many purposes. Van der Waals radii are determined from measurements of atomic spacing between pairs of unbonded atoms in crystals.

616.

The covalent radius in chemistry corresponds to half of the distance between two identical atomic nuclei, bound by a covalent bond.

620.

A dehydrator is a piece of laboratory apparatus, often made of glass, and which serves to dry chemical matters; that is, to remove water or liquid from a sample.
[tab][tab][tab]In principle it is a glass bowl with cap that has a planar grinding, so that the bowl is air-tight. The dehydrator's lower part is ordinarily filled with a drying agent such as calcium chloride, silica gel, phosphoric anhydride or sulphuric acid. The sample to be dried is placed on a diaphanous cartridge of plastic or ceramic above the drying agent.
[tab][tab][tab]The drying agent is hygroscopic, which means that it dehumidifies its environment by absorbing water vapor. The dry atmosphere then takes up water from the sample to be dried.