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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 ...
Standard atomic weight; Density |density= Melting point in kelvin |mpK= Boiling point in kelvin |bpK= Specific heat capacity |heatcapacity= Electronegativity |elnegativity= Abundance in Earth's crust |abundance= Occurrence; Phase; Columns (properties) that have no parameter are read from the § element data lists
Primordial From decay Synthetic Border shows natural occurrence of the element Standard atomic weight A r, std (E) [ 1 ] Ca: 40.078 — Abridged value (uncertainty omitted here) [ 2 ]
Each chemical element has a unique atomic number (Z— for "Zahl", German for "number") representing the number of protons in its nucleus. [4] Each distinct atomic number therefore corresponds to a class of atom: these classes are called the chemical elements. [5] The chemical elements are what the periodic table classifies and organizes.
This small radius and high weight cause it to be expected to have an extremely high density of around 46 g·cm −3, over twice that of osmium, currently the most dense element known, at 22.61 g·cm −3; element 164 should be the second most dense element in the first 172 elements in the periodic table, with only its neighbor unhextrium ...
"Variation of lead isotopic composition and atomic weight in terrestrial materials (IUPAC Technical Report)". doi : 10.1515/pac-2018-0916 . * "2020" is an inconsistent year for change publication: CIAAW maintains that only odd years, changes are publicised.
This happens to fill the whole periodic table in 7 rows (periods). Heavier elements (atomic number 119 and higher) are theoretically described, and start in period 8 (row 8). When these undiscovered elements are placed in the periodic table, it is called an extended periodic table.
This table lists only the occurrences in compounds and complexes, not pure elements in their standard state or allotropes. Noble gas +1 Bold values are main oxidation states