how are elements arraged in periodic tables.?

Answer 1

Follow this link for a detailed explanation of the system.

Answer 2

Periodic table
A list of elements (atoms) ordered along horizontal rows according to atomic number (the number of electrons in an atom and also the charge on its nucleus). In the periodic table (see illustration), the rows are arranged so that elements with nearly the same chemical properties occur in the same column (group), and each row ends with a noble gas (closed-shell element that is generally inert). For chemists, the position of atoms in the periodic table provides the most powerful guide for classifying the expected properties of molecules and solids made from these particular atoms. See also Inert gases.


Periodic table. The atomic numbers are listed above the symbols identifying the elements. The heavy line separates metals from nonmetals.

The origin of the periodic table was explained in the 1920s in terms of the basic physical laws (quantum mechanics) obeyed by the electrons of an atom. Thus, the rows in the periodic table correspond to the shell number, n, and groups correspond to a particular electronic configuration designated by the number and type of electrons in the outermost shell. These electrons govern chemical properties and are known as valence electrons. See also Electron configuration; Valence.

Additional information from the physical laws of atoms can be incorporated into the periodic table and can greatly enhance its organizing capability. For example, configuration energy adds a third dimension to the periodic table. The configuration energy is defined in terms of the ionization energy (l), the energy required to remove an electron from an atom.

Besides enhancing the organizing capability of the periodic table, the concept of configuration energy explains many longstanding puzzles about the table itself. It explains the existence of the metalloid band of elements (configuration energy is nearly constant in this band) and why these elements divide the metals from the nonmetals. Elements possessing configuration energies with magnitudes greater than those of the metalloids are nonmetals; those with lower configuration energies are metals. See also Nonmetal.

The lack of numerical or analytic connection between the traditional two-dimensional periodic table and methods used to predict the structure and reactivity of molecules and solids has long reduced the table's usefulness. However, configuration energy, introduced as a new dimension of the periodic table, is just the average atomic energy level, and simultaneously the average density of states, for the atoms out of which the molecular-orbit–energy-level diagrams and energy bands in solids are constructed, thereby tying the periodic table directly to present-day research techniques. See also Molecular orbital theory; Molecular structure and spectra.

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Answer 3

Hi. By groups and columns. The groups, like the rare earth elements, and the noble gasses in a column have similar electron structures in their outer shells

Answer 4

Based on Molecular weight of single component not moelcule

Answer 5

They are arranged by their atomic number on most periodic tables.

Answer 6

by the number of protons within the element's atomic nucleus

Answer 7

Alphabetically, in Sanskrit.