A bond in which two atoms share pair of electrons.


Related Terms

POLARIZABILITY

The electric dipole moment induced in a system, such as an atom or molecule, by an electric field of unit strength.

NEUMANN-KOPP RULE

The rule that the heat capacity of 1 mole of a solid substance is approximately equal to the sum over the elements forming the substance of the heat capacity of a gram atom of the element times the number of atoms of the element in a molecule of the substance.

IMPLANTED ATOM

An atom introduced into semiconductor material by ion implantation.

EMISSION SPECTROMETER

Works on the basis that atoms of metallic and other particular elements emit light at characteristic wavelengths when they are excited in a flame, arc, or spark. Excited light is directed through an entrance slit in the spectrometer. This light penetrates the slit, falls on a grate, and is dispersed and reflected. The spectrometer is calibrated by a series of standard samples containing known amounts of the elements of interest. By exciting these standard samples, an analytical curve can be established which gives the relationship between the light intensity and its concentration in the fluid.

ATOM

The smallest complete particle of an element, which can be obtained, yet which retains all physical and chemical properties of the element.

ATOMIC WEIGHT

The weight of an elementary atom, in relation to the weight of an atom of hydrogen. A hydrogen atom being taken as 1.00g.

FERRIC ION

An iron atom that has a positive electric charge of +3. (Fe2+)

VALENCE ELECTRON

An electron in the outer shell of an atom that takes part in forming chemical bonds or in the flow of electrical current.

ION

A charge atom or radical which may be positive or negative.

NEGATIVE CHARGE

The electrical potential which an atom acquires when it gains one or more electrons; a characteristic of an anion.

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