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Τι (ποιος) είναι atomic$5690$ - ορισμός

METHOD TO IDENTIFY CHEMICAL ELEMENTS BY THEIR ABSORPTION OF RADIATION

STPF; Stpf; Atomic Absorption Spectrometer; Atomic absorption spectrophotometry; Atomic Absorption Spectrophotometry; Atomic absorption spectrometer; Atomic absorption; Atomic absorption spectrometry; Atomic absorption spectrometry determination; Atomic absorption spectrometric determination

Relative atomic mass

DIMENSIONLESS PHYSICAL QUANTITY: RATIO OF THE AVERAGE MASS OF ATOMS OF AN ELEMENT (IN EACH SAMPLE) TO ONE UNIFIED ATOMIC MASS UNIT. THE UNIFIED ATOMIC MASS UNIT, SYMBOL U, IS DEFINED BEING 1⁄12 OF THE MASS OF A CARBON-12 ATOM

Atomic weight; Atomic Weight; Average atomic mass; Atomic weights; Atomic weight/Table; Atomic wieght; Atomic mass/Table; Standard relative atomic mass; Relative mass

Relative atomic mass (symbol: A) or atomic weight is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant. The atomic mass constant (symbol: m) is defined as being of the mass of a carbon-12 atom.

https://en.wikipedia.org/wiki/Relative_atomic_mass

atomic weight

DIMENSIONLESS PHYSICAL QUANTITY: RATIO OF THE AVERAGE MASS OF ATOMS OF AN ELEMENT (IN EACH SAMPLE) TO ONE UNIFIED ATOMIC MASS UNIT. THE UNIFIED ATOMIC MASS UNIT, SYMBOL U, IS DEFINED BEING 1⁄12 OF THE MASS OF A CARBON-12 ATOM

Atomic weight; Atomic Weight; Average atomic mass; Atomic weights; Atomic weight/Table; Atomic wieght; Atomic mass/Table; Standard relative atomic mass; Relative mass

¦ noun Chemistry another term for relative atomic mass.

Atomic Weight

DIMENSIONLESS PHYSICAL QUANTITY: RATIO OF THE AVERAGE MASS OF ATOMS OF AN ELEMENT (IN EACH SAMPLE) TO ONE UNIFIED ATOMIC MASS UNIT. THE UNIFIED ATOMIC MASS UNIT, SYMBOL U, IS DEFINED BEING 1⁄12 OF THE MASS OF A CARBON-12 ATOM

Atomic weight; Atomic Weight; Average atomic mass; Atomic weights; Atomic weight/Table; Atomic wieght; Atomic mass/Table; Standard relative atomic mass; Relative mass

The number expressing the relative weight of the atom of any substance, that of hydrogen being generally taken as unity. This is the universal system, although any other element might be taken as the basis of the system. The whole theory of atomic weights is based on the indivisibility of the atom and on the theory of atomicity, q. v. (See Equivalents.) [Transcriber's note: The standard is now the isotope carbon-12 as exactly 12.]

Βικιπαίδεια

Atomic absorption spectroscopy

Atomic absorption spectroscopy (AAS) and atomic emission spectroscopy (AES) is a spectroanalytical procedure for the quantitative determination of chemical elements by free atoms in the gaseous state. Atomic absorption spectroscopy is based on absorption of light by free metallic ions.

In analytical chemistry the technique is used for determining the concentration of a particular element (the analyte) in a sample to be analyzed. AAS can be used to determine over 70 different elements in solution, or directly in solid samples via electrothermal vaporization, and is used in pharmacology, biophysics, archaeology and toxicology research.

Atomic emission spectroscopy was first used as an analytical technique, and the underlying principles were established in the second half of the 19th century by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff, both professors at the University of Heidelberg, Germany.

The modern form of AAS was largely developed during the 1950s by a team of Australian chemists. They were led by Sir Alan Walsh at the Commonwealth Scientific and Industrial Research Organisation (CSIRO), Division of Chemical Physics, in Melbourne, Australia.

Atomic absorption spectrometry has many uses in different areas of chemistry such as clinical analysis of metals in biological fluids and tissues such as whole blood, plasma, urine, saliva, brain tissue, liver, hair, muscle tissue. Atomic absorption spectrometry can be used in qualitative and quantitative analysis.

https://en.wikipedia.org/wiki/Atomic absorption spectroscopy