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Any of a variety of different structural forms of the same element, as with carbon, whose allotropes include diamonds, graphite, and fullerene. alloy A mixture of metals or of a metal and another element which in combination exhibit a metallic bonding character. Common examples include bronze, brass, and pewter. amalgam
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 ...
The naming of elements from astronomical objects stems from the ancient association of metals with the various planets and their gods, as follows: mercury with Mercury; copper with Venus; iron with Mars (named for the Roman god of war); tin with Jupiter (named for the Roman king of the gods); and lead with Saturn (named for the ancient, slow ...
41 of the 118 known elements have names associated with, or specifically named for, places around the world or among astronomical objects. 32 of these have names tied to the places on Earth, and the other nine are named after to Solar System objects: helium for the Sun; tellurium for the Earth; selenium for the Moon; mercury (indirectly), uranium, neptunium and plutonium after their respective ...
An element is a chemical substance made up of a particular kind of atom and hence cannot be broken down or transformed by a chemical reaction into a different element, though it can be transmuted into another element through a nuclear reaction.
1907 — Grouping of the elements to illustrate refractivity: Runs from group 12 on the left to group 13 on the right [113] 1918 — Cherkesov: Two periodic tables: Mn in group 8 rather than group 7 [114] 1920 — Stewart's arrangement of the elements: With 14 lanthanides incorporated [115] 1934 — Romanoff's system: Combined spiral-lemniscate ...
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However different isomers can have the same atomic composition while being different molecules. The empirical formula is often the same as the molecular formula but not always. For example, the molecule acetylene has molecular formula C 2 H 2 , but the simplest integer ratio of elements is CH.