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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 ...
This list includes substances that boil just above standard condition temperatures. Numbers are boiling temperatures in °C. 1,1,2,2,3-Pentafluoropropane 25–26 °C [151] [3] Dimethoxyborane 25.9 °C; 1,4-Pentadiene 25.9 °C; 2-Bromo-1,1,1-trifluoroethane 26 °C; 1,2-Difluoroethane 26 °C; Hydrogen cyanide 26 °C; Trimethylgermane 26.2 °C [96]
Element 4.15 0.04 I yes [2] [3] β-Hg: Element 3.95 0.04 I yes [2] [3] In: Element 3.4 0.03 I yes [2] [3] Ir: Element 0.14 0.0016 I yes [2] [8] α-La: Element 4.9 I yes [2] β-La: Element 6.3 I yes [2] Li: Element 4 × 10 −4: I [9] Mo: Element 0.92 0.0096 I yes [2] [8] Nb: Element 9.26 0.82 II yes [2] [3] Os: Element 0.65 0.007 I yes [2] Pa ...
Except at extreme temperatures and pressures, atoms form the three classical states of matter: solid, liquid and gas. Complex molecules can also form various mesophases such as liquid crystals, which are intermediate between the liquid and solid phases. At high temperatures or strong electromagnetic fields, atoms become ionized, forming plasma.
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.
Group → 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18; ↓ Period 1: H 2 20.271 K (−252.879 °C) He 4.222 K (−268.928 °C) 2: Li 1603 K (1330 °C) Be 2742 K ...
List of elements by atomic properties; List of elements by stability of isotopes; A. Abundance of elements in Earth's crust; D. Discovery of chemical elements; M.