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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 ...
[1] [2] Every positive integer is composite, prime, or the unit 1, so the composite numbers are exactly the numbers that are not prime and not a unit. [3] [4] E.g., the integer 14 is a composite number because it is the product of the two smaller integers 2 × 7 but the integers 2 and 3 are not because each can only be divided by one and itself ...
Element Origin of name [1] [2] Group Period Block Standard atomic weight A r °(E) [a] Density [b] [c] Melting point [d] Boiling point [e] Specific heat capacity [f] Electronegativity [g] Abundance in Earth's crust [h] Origin [i] Phase at r.t. [j] Atomic number Z Symbol Name ( g / cm 3 ) (K) ( J / g · K ) ( mg / kg ) 1 H ...
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.
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Numbers of the form pq where p and q are distinct primes congruent to 3 (mod 4). A016105: Magic numbers: 2, 8, 20, 28, 50, 82, 126, ... A number of nucleons (either protons or neutrons) such that they are arranged into complete shells within the atomic nucleus. A018226: Superperfect numbers
Periodic tables usually at least show the elements' symbols; many also provide supplementary information about the elements, either via colour-coding or as data in the cells. The above table shows the names and atomic numbers of the elements, and also their blocks, natural occurrences and standard atomic weights. For the short-lived elements ...
C 50 H 48 O 4: violanthrone-79: 85652-50-2 C 50 H 49 N 15 O 15 S: geninthiocin: 158792-27-9 C 50 H 50 N 14 O 9 S 6: amythiamicin C: 156620-47-2 C 50 H 51 N 15 O 8 S 6: amythiamicin A: 152741-89-4 C 50 H 53 N 15 O 9 S 6: amythiamicin B: 156620-48-3 C 50 H 57 N 3 O 12: NCI 144-128: 36674-84-7 C 50 H 60 O 10: ergophilone A: 166603-97-0 C 50 H 60 ...