kleid für standesamt: Define Periodic Table

The periodic table has been called the bible of chemistry. The name is appropriate when considering the involvement of the table in every chemist's work. It acts as a constant, vital reference and organizational chart, its structure reflecting many of the known properties of all elements.

The periodic table of the elements is basically an arrangement of all known elements. Several properties of each element determines its configuration, like number of protons and electrons, along with its atomic weight. The table is a vital reference for all types of chemical research, since an element's place on the table can tell a chemist several pieces of vital information.

The table is unofficially attributed to Dmtri Mendeleev, a Russian chemist who first published the table in the mid 19th century. The claim is unofficial, however, because several chemists before him contributed to the formation of the table by examining the properties of elements and the patterns they form. The table had been being formed for several years beforehand, Mendeleev was simply the first to make it official.

The rows of the periodic table are commonly called periods, giving the table part of its namesake. The period number is determined by the highest energy level of an electron in the element. Elements in the same period are not necessarily sharing the same properties; often, the left side of the row contains active solids while the right side is made up of inactive gases. The period number increases as you move down (left to right) the table.

The columns of the table are often called groups, or families. There are 18 groups in the table. They are determined based on the specific electron configuration, so if two elements are in the same column the have the same valence electron configuration. This basically means that these two elements will behave similarly in chemical reactions.

Each box in the periodic table has the same structure and can be read the same way. First, the very top number is called the atomic number. It refers to the number of protons in one atom of that element. This progresses down the table, with hydrogen (pictured) being first. Next, the central letter is the abbreviation for the element represented. Some are intuitive, like H meaning hydrogen. Some are not, like K meaning potassium. The lowest number is the atomic weight, which is the weight of one atom of the element.

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See also: Periodic Table of the Elements (table) Periodic Table of the Elements (showing atomic number and atomic symbol; click on atomic symbol for more detailed ...
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The periodic table has been called the bible of chemistry. The name is appropriate when considering the involvement of the table in every chemist's work. It acts as a ...
Periodic Table Define Periodic Table at Dictionary.com
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noun Chemistry . a table illustrating the periodic system, in which the chemical elements, formerly arranged in the order of their atomic weights and now according to ...
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The periodic classification of elements is one of the most significant classifications in science, since it summarizes the facts of inorganic chemistry in a tabular ...
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periodic table n. Chemistry A tabular arrangement of the elements according to their atomic numbers so that elements with similar properties are in the same column ...
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The periodic table of the chemical elements, also called the Mendeleev periodic table, is a tabular display of the known chemical elements. The elements are arranged ...
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periodic table n. Chemistry A tabular arrangement of the elements according to their atomic numbers so that elements with similar properties are in the same column ...
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Periodic Table definition, as used in chemistry, chemical engineering, and physics.
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The periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations, and recurring chemical ...
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Period (periodic table) - Wikipedia, the free encyclopedia
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In the periodic table of the elements, elements are arranged in a series of rows (or periods) so that those with similar properties appear in a column. Elements of ...
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an arrangement of the chemical elements according to their atomic numbers, to exhibit the periodic law
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The periodic classification of elements is one of the most significant classifications in science, since it summarizes the facts of inorganic chemistry in a tabular ...
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Definition of periodic table. What does periodic table mean? Meaning of periodic table. periodic table synonyms, pronunciation, spelling and more from Free Dictionary.
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Definition of PERIODIC TABLE: an arrangement of chemical elements based on the periodic law
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Definition of Periodic table ... The periodic table is a tabular display of the chemical elements, organized on the basis of their properties.
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periodic table n. A tabular arrangement of the elements according to their atomic numbers so that elements with similar chemical properties are in the same column ...
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In the periodic table of the elements, elements are arranged in a series of rows (or periods) so that those with similar properties appear in a column. Elements of ...
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Periodic Table definition: A table in which the chemical elements are arranged in order of increasing atomic number. Elements with similar properties are arranged in ...
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A periodic table group is a vertical column in the periodic table of the chemical elements. There are 18 groups in the standard periodic table. It is no accident that ...