Updated February 20, 2019.
1 H -- Hydrogen. More or less discovered in 1766. Represents 0.14% of the Earth's crust (but about 11% of the mass of the Earth's water), 73.9% of the mass of the universe. Element of the Month, May 2013.
- 2 He Helium. Discovered1895. Represents 24% of the mass of the universe.
3 Li -- Lithium. Discovered 1817. Element of the Month, February 2017.
4 Be --Beryllium. Discovered 1797. Represents .0002% of the Earth's crust. Element of the Month, December 2009.
5 B -- Boron. Discovered 1808. Represents .002% of the Earth's crust. Element of the Month, March 2011. First Runner-Up, Element of the Year 2011!
6 C -- Carbon. ancient. Represents 0.094% of the Earth's crust, .46% of the mass of the universe. Element of the Month, February 2017.
7 N -- Nitrogen. Discovered 1772. Represents .005% of the Earth's crust (but 78.1% of Earth's atmosphere), .096% of the mass of the universe. Element of the Month, May 2011. ELEMENT OF THE YEAR 2011!
8 O -- Oxygen. Discovered 1774. Represents 46.71% of the mass of the Earth's crust (20.9% of Earth's atmosphere), 1.04% of the mass of the universe. Element of the Month, June 2010. ELEMENT OF THE YEAR 2010!
9 F -- Fluorine. Discovered 1886. Represents 0.029% of the Earth's crust. Element of the Month, June 2016.
10 Ne -- Neon. Discovered 1898. Not present in Earth's crust, but is .000012% of Earth's atmosphere. Represents .134% of the mass of the universe. Element of the Month November, 2010.
11 Na -- Sodium. Discovered 1807. Represents 2.75% of the Earth's crust. Element of the Month, June 2014.
- 12 Mg -- Magnesium. Discovered 1755. Represents 2.08% of the Earth's crust, .058% of the mass of the universe.
- 14 Si -- Silicon. Discovered 1824. Represents 27.69% of the Earth's crust .065% of the mass of the universe.
- 15 P --Phosphorus. Discovered 1669. Represents 0.13% of the Earth's crust.
17 Cl -- Chlorine. Discovered 1774. Represents 0.045% of the Earth's crust. Element of the Month, September 2010.
18 Ar -- Argon. Discovered 1894. Trace amounts in Earth's crust, but is .96% of Earth's atmosphere. Element of the Month, April 2017
19 K -- Potassium. Discovered 1807. Represents 2.58% of the Earth's crust. Element of the Month, December 2011. Second Runner-Up, Element of the Year 2011!
20 Ca -- Calcium. Discovered 1808. Represents 3.65% of the Earth's crust, .006% of the mass of the universe. Element of the Month, June 2012.
21 Sc -- Scandium. Discovered 1879. Represents perhaps .00002% of the Earth's crust. Element of the Month, January 2013.
- 22 Ti -- Titanium. 1791. Represents 0.62% of the Earth's crust.
- 23 V -- Vanadium 1830
- 25 Mn -- Manganese 1774. Represents 0.09% of the Earth's crust.
- 26 Fe -- Iron ancient. Represents 5.05% of the Earth's crust, .109% of the mass of the universe.
28 Ni -- Nickel. Discovered 1751. Represents 0.019% of the Earth's crust. Element of the Month, November 2014.
29 Cu -- Copper. Known in antiquity. Represents .01% of the Earth's crust. Element of the Month, July 2012.
30 Zn -- Zinc. More or less known in antiquity. Element of the Month, March 2017.
31 Ga -- Gallium. Isolated 1875. Element of the Month, October 2012.
- 32 Ge -- Germanium 1886
- 33 As -- Arsenic ancient
- 34 Se -- Selenium 1817
- 36 Kr -- Krypton 1898
- 37 Rubidium 1861
39 Y -- Yttrium. Discovered 1794. Represents .003% of the Earth's crust. Element of the Month, April 2010. Second Runner-Up, Element of the Year 2010!!
40 Zr -- Zirconium. Discovered 1789. Represents .025% of the Earth's crust. Element of the Month, March 2012.
41 Nb -- Niobium. Differentiated from Tantalum 1846. Represents .002% of the Earth's crust. Element of the Month, July 2011.
42 Mo -- Molybdenum. Discovered 1781. Represents .00015% of the Earth's crust. Element of the Month, January 2011.
43 Tc -- Technetium. Discovered 1937. Element of the Month, August 2013.
44 Ru -- Ruthenium. Discovered 1844. Represents .0000001% of the Earth's crust. Inaugural Element of the Month, November 2009.
45 Rh -- Rhodium. Discovered 1803. Represents ____________% of the Earth's crust. Element of the Month, October 2014.
46 Pd -- Palladium. Discovered 1802. Represents ____________% of the Earth's crust. Element of the Month, November 2012.
47 Ag -- Silver. Known in antiquity. Represents .000007% of the Earth's crust. Element of the Month, July 2010.
- 48 Cd-- Cadmium 1817
- 50 Sn -- Tin ancient
- 52 Te -- Tellurium 1783
54 Xe -- Xenon. Discovered 1898. Represents .000000087% of the Earth's Atmosphere. Element of the Month, February 2010. First Runner-Up, Element of the Year 2010!!
55 Cs -- Cesium. Discovered 1860. Element of the Month, December 2014.
- 56 Ba -- Barium 1808 0.05
- 58 Ce -- Cerium 1803
- 60 Nd -- Neodymium 1885
- 62 Sm -- Samarium 1879
64 Gd -- Gadolinium. Isolated in 1880. Element of the Month, May 2014.
65 Tb -- Terbium. Discovered 1843. Represents .0001% of the Earth's crust. Element of the Month, November 2011.
66 Dy -- Dysprosium. Isolated in 1886. Element of the Month, July 2016.
68 Er -- Erbium. Discovered 1842. Element of the Month, March 2016.
- 69 Tm -- Thulium 1879
71 Lu -- Lutetium. Discovered 1907. Represents _______% of the Earth's crust. Element of the Month, September 2014.
- 72 Hf -- Hafnium 1923
74 W -- Tungsten. Discovered 1783. Represents .019% of the Earth's crust. Element of the Month, May 2010.
- 75 Re -- Rhenium 1925
77 Ir -- Iridium. Discovered 1803. Represents .00000003% of the Earth's crust. Element of the Month, January 2012.
- 78 Pt -- Platinum. 1735
80 Hg -- Mercury. Discovered in antiquity. Element of the Month, March 2015.
81 Tl -- Thallium. Discovered 1862. Represents .00006% of the Earth's crust. Element of the Month, February 2011.
82 Pb -- Lead. Discovered in antiquity. Element of the Month, April 2014.
83 Bi -- Bismuth. Known since the Middle Ages. Element of the Month, January 2017.
- 84 Po -- Polonium 1898
- 85 At -- Astatine 1940
87 Fr -- Francium. Discovered 1939. Perhaps a shot-glass' worth exists on the Earth's crust at any given moment. Element of the Month, September 2012.
- 88 Ra -- Radium 1898
- 89 Ac -- Actinium 1899
91 Pa -- Protactinium. Discovered 1913. Element of the month, October 2014
- 92 U -- Uranium 1789
94 Pu -- Plutonium Discovered 1940. Mostly Fakey Element. Element of the Month, December 2013.
- 95 Am -- Americium. 1944
- 97 Bk -- Berkelium. 1949
- 98 Cf -- Californium. 1950
- 100 Fm -- Fermium 1952
102 No -- Nobelium. Concocted 1958. Fakey Element. Element of the Month, January 2015.
103 Lr -- Lawrencium. Created 1961. Fakey Element. Element of the Month, August 2011.
104 Rf -- Rutherfordium. Created 1964. Fakey Element. Element of the Month, April 2015.
105 Db -- Dubnium. Created 1970, dubbed 1997, no pun intended. Extremely Fakey Element. Element of the Month, February 2019.
106 Sg -- Seaborgium. Created 1974, dubbed 1997. Extremely Fakey Element. Element of the Month, March 2013.
107 Bh -- Bohrium. Created 1981, dubbed 1992. Extremely Fakey Element. Element of the Month, August 2012.
108 Hs -- Hassium. Created 1984, dubbed 1994. Extremely Fakey Element. Element of the Month, August 2012.
109 Mt -- Meitnerium. Created 1982, dubbed 1997. Extremely Fakey Element. Element of the Month, October 2015.
- Etc.
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