

A249874


Atomic numbers of the chemical elements sorted by date of discovery.


7



15, 27, 78, 28, 83, 12, 1, 8, 7, 56, 17, 25, 42, 74, 52, 38, 40, 92, 22, 39, 24, 4, 23, 41, 73, 46, 58, 76, 77, 45, 19, 11, 20, 5, 9, 53, 3, 48, 34, 14, 13, 35, 90, 57, 68, 65, 44, 55, 37, 81, 49, 2, 31, 70, 67, 69, 21, 62, 64, 59, 60, 32, 66, 18, 63, 36, 10, 54, 84, 88, 86, 89, 71, 75, 91, 72, 43, 87, 93, 85, 94, 61, 96, 95, 97, 98, 99, 100, 101, 103, 102, 104, 105, 106, 107, 109, 108, 110, 111, 112, 114, 116, 118, 115, 113, 117
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OFFSET

13,1


COMMENTS

Since the first 12 elements (carbon (6), sulfur (16), iron (26), copper (29), zinc (30), arsenic (33), silver (47), tin (50), antimony (51), gold (79), mercury (80), and lead (82)) are "ancient" (and hence the exact order of their discovery is vague), they have been omitted. The list starts with the first actual date that is given, which is 1669.


LINKS

Table of n, a(n) for n=13..118.
Wikipedia, Timeline of chemical element discoveries.


EXAMPLE

Year of their discovery: 1669, 1735, 1735, 1751, 1753, 1755, 1766, 1771, 1772, 1772, 1774, 1774, 1778, 1781, 1782, 1787, 1789, 1789, 1791, 1794, 1794, 1798, 1801, 1801, 1802, 1802, 1803, 1803, 1803, 1804, 1807, 1807, 1808, 1808, 1810, 1811, 1817, 1817, 1817, 1823, 1825, 1825, 1829, 1838, 1843, 1843, 1844, 1860, 1861, 1861, 1863, 1868, 1875, 1878, 1878, 1879, 1879, 1879, 1880, 1885, 1885, 1886, 1886, 1894, 1896, 1898, 1898, 1898, 1898, 1898, 1899, 1902, 1906, 1908, 1913, 1922, 1937, 1939, 1940, 1940, 1940, 1942, 1944, 1944, 1949, 1950, 1952, 1952, 1955, 1961, 1966, 1969, 1970, 1974, 1981, 1982, 1984, 1994, 1994, 1996, 1999, 2000, 2002, 2003, 2003, 2009.  Jianing Song, Sep 30 2018


CROSSREFS

Chemical elements sorted by: A081098 (melting point), A081099 (boiling point), A081100 (atomic radius), A081101 (covalent radius), A248026 (electronegativity), A248061 (density), this sequence (discovery).
Sequence in context: A343139 A087719 A174216 * A116070 A186074 A230649
Adjacent sequences: A249871 A249872 A249873 * A249875 A249876 A249877


KEYWORD

nonn,less


AUTHOR

Bo Lee, Nov 07 2014


EXTENSIONS

Offset changed to 13 by N. J. A. Sloane, Oct 06 2018


STATUS

approved



