Information about Period (periodic Table)
In the periodic table of the elements, a period is a horizontal row of the table.
The elements are laid out in a series rows so that those with similar properties line up in horizontal columns: this reflects the periodic recurrence of similar properties as atomic weight increases.
Modern quantum mechanics explains these periodic trends in properties in terms of electron shells. As atomic number increases, electron shells are filled in roughly this order. The filling of each shell corresponds to a row in the table.
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p 6f 7d 7f
...
Hence the structure of the periodic table. Since the valence electrons determine chemical properties, those tend to be similar within periodic table groups.
Elements adjacent to one another within a group have similar physical properties, despite their significant differences in mass. Elements adjacent to one another within a period have similar mass but different properties.
The periodic table of the chemical elements is a tabular method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869.
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The periodic table of the chemical elements is a tabular method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869.
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The elements are laid out in a series rows so that those with similar properties line up in horizontal columns: this reflects the periodic recurrence of similar properties as atomic weight increases.
Modern quantum mechanics explains these periodic trends in properties in terms of electron shells. As atomic number increases, electron shells are filled in roughly this order. The filling of each shell corresponds to a row in the table.
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p 6f 7d 7f
...
Hence the structure of the periodic table. Since the valence electrons determine chemical properties, those tend to be similar within periodic table groups.
Elements adjacent to one another within a group have similar physical properties, despite their significant differences in mass. Elements adjacent to one another within a period have similar mass but different properties.
standard periodic table below.
The periodic table of the chemical elements is a tabular method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869.
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chemical element, or element, is a type of atom that is defined by its atomic number; that is, by the number of protons in its nucleus. The term is also used to refer to a pure chemical substance composed of atoms with the same number of protons.
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atomic mass (ma) is the mass of an atom at rest, most often expressed in unified atomic mass units.[1] The atomic mass may be considered to be the total mass of protons, neutrons and electrons in a single atom (when the atom is motionless).
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quantum mechanics is the study of the relationship between energy quanta (radiation) and matter, in particular that between valence shell electrons and photons. Quantum mechanics is a fundamental branch of physics with wide applications in both experimental and theoretical physics.
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An electron shell, also known as a main energy level, is a group of atomic orbitals with the same value of the principal quantum number n. Electron shells are made up of one or more electron subshells, or sublevels
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See also: List of elements by atomic number
In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom. It is traditionally represented by the symbol Z.
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In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom. It is traditionally represented by the symbol Z.
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In chemistry, valence electrons are the electrons contained in the outermost, or valence, electron shell of an atom. Valence electrons are important in determining how an element reacts chemically with other elements: The fewer valence electrons an atom holds, the less
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A group, also known as a family, is a vertical column in the periodic table of the chemical elements. There are 18 groups in the standard periodic table.
The modern explanation of the pattern of the periodic table is that the elements in a group have similar
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The modern explanation of the pattern of the periodic table is that the elements in a group have similar
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standard periodic table below.
The periodic table of the chemical elements is a tabular method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869.
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Lanthanides lanthanum
57
La cerium
58
Ce praseodymium
59
Pr neodymium
60
Nd promethium
61
Pm samarium
62
Sm europium
63
Eu gadolinium
64
Gd terbium
65
Tb dysprosium
66
Dy holmium
67
Ho erbium
68
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57
La cerium
58
Ce praseodymium
59
Pr neodymium
60
Nd promethium
61
Pm samarium
62
Sm europium
63
Eu gadolinium
64
Gd terbium
65
Tb dysprosium
66
Dy holmium
67
Ho erbium
68
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<noinclude>The Detailed Table is a smaller version of the huge table.
</noinclude>
Group 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
I II III IV V VI VII VIII
Period
1 hydrogen
1
H
1.
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</noinclude>
Group 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
I II III IV V VI VII VIII
Period
1 hydrogen
1
H
1.
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The text-only table is a version of the large table designed for printing atomic mass data. Colors representing chemical series have been removed, and all links have been removed. The least significant digit has been dropped if its uncertainty is greater than 1.
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<onlyinclude> This large version of the periodic table contains the symbol, name, atomic number, and standard atomic weight of each element. The key below explains the color-coding and layout of each entry.
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prevew not available
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prevew not available
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An extended periodic table was suggested by Glenn T. Seaborg in 1969. It is a logical extension of the principles behind the standard periodic table to include possible undiscovered chemical elements.
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Chemical series of the periodic table
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prevew not available
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Alternative periodic tables are chemical element displays different from the well known Mendeleev periodic table. Several have been devised often purely for didactic reasons as not all correlations between the chemical elements are effectively captured by the standard periodic
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<onlyinclude> This is a list of chemical elements, sorted by name and color coded according to type of element.
Given is each element's element symbol, atomic number, atomic mass or most stable isotope, and group and period numbers on the periodic table.
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Given is each element's element symbol, atomic number, atomic mass or most stable isotope, and group and period numbers on the periodic table.
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<onlyinclude> This is a list of chemical elements by symbol, including the current signification used to identify the chemical elements as recognized by the International Union of Pure and Applied Chemistry, as well as proposed and historical signs.
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A table of chemical elements ordered by atomic number and color coded according to type of element. Given is each element's name, element symbol, group and period, Chemical series, and atomic mass (or most stable isotope).
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Chemical series of the periodic table
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Chemical series of the periodic table
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Periods:]] 1 2 3 4 5 6 7 8
Series Alkalis Alkaline earths Lanthanides Actinides Transition metals Poor metals Metalloids Nonmetals Halogens Noble gases
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Series Alkalis Alkaline earths Lanthanides Actinides Transition metals Poor metals Metalloids Nonmetals Halogens Noble gases
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This is a list of chemical elements, sorted by relative atomic mass, or more precisely the standard atomic weights, (most stable isotope for artificial elements) and color coded according to type of element.
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