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2. File:The Periodic Table of the Elements in Pictures.pdf

   en.wikipedia.org/wiki/File:The_Periodic_Table_of...

   English: This pictorial periodic table is colorful, boring, and packed with information. In addition to the element's name, symbol, and atomic number, each element box has a drawing of one of the element's main human uses or natural occurrences.

3. List of chemical elements - Wikipedia

   en.wikipedia.org/wiki/List_of_chemical_elements

   A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...

4. Atomicity (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Atomicity_(chemistry)

   Atomicity may vary in different allotropes of the same element. The exact atomicity of metals, as well as some other elements such as carbon, cannot be determined because they consist of a large and indefinite number of atoms bonded together. They are typically designated as having an atomicity of 2.

5. Periodic table - Wikipedia

   en.wikipedia.org/wiki/Periodic_table

   The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows ("periods") and columns ("groups"). It is an icon of chemistry and is widely used in physics and other sciences.

6. Quantities, Units and Symbols in Physical Chemistry

   en.wikipedia.org/wiki/Quantities,_Units_and...

   Section 3.8 introduces atomic units and gives a table of atomic units of various physical quantities and the conversion factor to the SI units. Section 7.3(v) gives a concise but clear tutorial on practical use of atomic units, in particular how to understand equations "written in atomic units".

7. List of elements by atomic properties - Wikipedia

   en.wikipedia.org/wiki/List_of_elements_by_atomic...

   This is a list of chemical elements and their atomic properties, ordered by atomic number (Z). Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.