Elements and names

###	List of misindentified elements (chronological order):

-Didymium (1841) Praseodymium and neodymium
-Pelopium (1846) Niobium and tantalum
-Ilmenium (1847) Niobium and tantalum
-Dianium (1860) Niobium and tantalum
-Wasium (1862) Mixture of rare earths
-Nebulium (1864) Oxygen O2+ ion
-Coronium (1869) Ionised Iron
-Davyum (1877) Iridium and rhodium
-Decipium (1878) Samarium and other rare earths
-Austrium (1886) Gallium
-Gnomium (1892) Hypothised with error due to similarities to nickel and iron, hypothesis later explained with atomic nums theory
-Lucium (1896) Yttrium
-Victorium and Monium (1897) Gadolinium and terbium
-Berzelium and Carolinium (1901) Thorium
-Nipponium (1908) Rhenium (discoverer thought he found Technetium, still a new element, but wrong atomic number)
-Neutronium (1926) element 0, non-existant

###	Proposed names and controversy for some theorised elements:

- Columbium/Niobium (41)
- Ytterbium/Aldebaranium (70)
- Lutetium/Cassiopeium (71)
- Wolfram/Tungsten (74)
- Astatitine/Alabamium (85)
- Radon/Niton (86)
- Actinium/Emanium (89)
- Thorium/Ionium (90)
- Protactinium/Brevium (91)

#Theorised names from Mendeleev's first work 1869:

- Eka-boron (Sc 21) later discovered as Scandium
- Eka-aluminium (Ga 31) later discovered as Gallium
- Eka-manganese (Tc 43) later discovered as Technetium
- Eka-silicon (Ge 32) later discovered as Germanium

He predicted an heavier element under Titanium (22) and Zirconium (40), and put element Lanthanum (58) instead of the actual element Hafnium (72), discovered in 1923

#Second update in 1871

- Dvi-manganese (Re 75) later discovered as Rhenium
- Dvi-tellurium (Po 84) later discovered as Polonium
- Dvi-caesium (Fr 87) later discovered as Francium
- Eka-tantalum (Pa 91) later discovered as Protactinium

#After 1904, with atomic number measurement theory, elements 43 (Technetium), 61 (Promethium), 72 (Hafnium), 75 (Rhenium), 85 (Astatine), and 87 (Francium) where theorised and discovered noticing holes in the periodic table suggesting their existance.


#Theorisation of elements -> Pure Isolation  (* means Mendeleev I, ** Mendeleev II, *** atomic measurement),then a short empirical classification of discovery
 

 #Theorised before game starts

- 9  Fluorine 1771 -> 1886 (Advanced Chemistry)
- 92 Uranium 1789 -> 1841 (Basic Chemistry)
- 90 Thorium 1829 -> 1914 (Spectroscopy and Advanced Chemistry) (possible to obtain metallic Na in 1859 or 1886)
- 39 Yttrium 1794 -> 1843 (Basic Chemistry)
- 23 Vanadium 1801 -> 1867 (Basic Chemistry)
- 41 Niobium 1801 -> 1864 (Basic Chemistry)
- 77 Tantalum 1802 -> 1844 (Basic Chemistry)

#Theorised before Mendeleev table
- 57 Lanthanum 1838 -> 1842 (Basic Chemistry)
- 60 Neodymium (Didyium erroneously) 1841 -> 1885 (Spectroscopy and Advanced Chemistry)
- 68 Herbium 1843 -> 1879 (Advanced Chemistry)
- 65 Terbium 1843 -> 1886 (Spectroscopy and Advanced Chemistry)
- 44 Ruthenium 1844 -> 1844 (Basic Chemistry)


#Theorised before Mendeleev table
- 55 Caesium 1860 -> 1882 (Spectroscopy)
- 37 Rubidium 1861 -> 1863 (Spectroscopy)
- 81 Tallium 1861 -> 1862 (Spectroscopy)
- 49 Indium 1863 -> 1864 (Spectroscopy)
- 2 Helium 1868 -> 1895 (Spectroscopy during Eclipse)

#Theorised after Mendeleev table

- 31 Gallium 1869 -> 1875 -> 1978 * (Spectroscopy)
- 70 Ytterbium 1878 -> 1906 (Spectroscopy and Advanced Chemistry)
- 67 Holmium 1878 -> 1879 (Spectroscopy)
- 21 Scandium 1871 -> 1879 -> 1879 * (Spectroscopy)
- 69 Thulium 1879 -> 1879 (Spectroscopy)
- 62 Samarium 1879 -> 1879 (Spectroscopy)
- 64 Gadolinium 1880 -> 1886 (Spectroscopy)
- 59 Praseodymium 1885 -> 1885 (Didymium) (Spectroscopy and Advanced Chemistry)
- 32 Germanium 1871 -> 1886 * (Spectroscopy)
- 66 Dysprosium 1886 -> 1905 (Spectroscopy and Advanced Chemistry)

# 
- 18 Argon 1894 -> 1894 (Spectroscopy)
- 63 Europium 1898 -> 1901 (Spectroscopy and Advanced Chemistry)
- 36 Krypton 1898 -> 1898 (Spectroscopy)
- 10 Neon 1898 -> 1898 (Spectroscopy)
- 54 Xenon 1898 -> 1898 (Spectroscopy)
- 84 Polonium 1871 -> 1898 -> 1902 ** (Spectroscopy and Advanced Chemistry)
- 88 Radium 1898 -> 1902 (Spectroscopy and Advanced Chemistry)
- 86 Radon 1899 -> 1910 (from Radium through Spectroscopy)
- 89 Actinium 1902 -> 1903 (Radioactivity studies)
- 61 Promethium 1914 -> 1945 -> 1945 *** (Advanced Chemistry adn Radioactivity studies)
- 85 Astatine 1914 -> 1940 *** (Advanced Chemistry adn Radioactivity studies)
- 71 Lutetium 1906 -> 1906 (Advanced Chemistry)
- 75 Rhenium 1908 -> 1919 (X-Ray spectroscopy)
- 91 Protactinium 1871 -> 1913 -> 1927 ** (Advanced Chemistry adn Radioactivity studies)

#
- 72 Hafnium 1904 -> 1922 -> 1922 *** (Advanced Chemistry)
- 43 Technetium 1871 -> 1914 -> 1937 -> 1937 */*** (Cyclotrone isotopes bombardment)
- 87 Francium 1871 -> 1904 -> 1914 -> 1939 **/*** (X-Ray spectroscopy and Radioactivity studies)

###CLASSICAL CHEMISTRY###

#Theorisation 
57 Lanthanum
60 Neodymium (Didyium)
68 Herbium
65 Terbium
44 Ruthenium
Later (1860s):
55 Caesium
37 Rubidium
81 Tallium
49 Indium
2 Helium

#Discoveries
92 Uranium
39 Yttrium
23 Vanadium
41 Niobium
77 Tantalum
57 Lanthanum
44 Ruthenium

#Validation
None

#False discoveries
Didymium
Pelopium
Ilmenium
Dianium
Wasium

#Proof of false discovery
None

###CHEMISTRY LAB###

#Theorisation 
###Mendeleev
31 Gallium
21 Scandium
32 Germanium
84 Polonium
91 Protactinium*
43 Technetium*
87 Francium*

#Others
70 Ytterbium
67 Holmium
69 Thulium
62 Samarium

#Discovery
9  Fluorine
68 Herbium

#False discovery
Davyum
Decipium
Austrium
Gnomium
Lucium
Victorium and Monium

#Validation
92 Uranium
39 Yttrium
23 Vanadium
41 Niobium
77 Tantalum
57 Lanthanum
44 Ruthenium

#Proof of false element
Pelopium
Ilmenium
Dianium

###SPECTROSCOPY ANALYSIS###

#Theorisation
64 Gadolinium
59 Praseodymium 
66 Dysprosium
18 Argon
63 Europium
36 Krypton
10 Neon
54 Xenon
88 Radium
86 Radon
89 Actinium
71 Lutetium
75 Rhenium

#Discovery
55 Caesium
37 Rubidium
81 Tallium
49 Indium
2 Helium
31 Gallium
67 Holmium
69 Thulium
62 Samarium
64 Gadolinium
32 Germanium
18 Argon
36 Krypton
10 Neon
54 Xenon

#Validation
39 Yttrium
23 Vanadium
41 Niobium
77 Tantalum
57 Lanthanum
44 Ruthenium
9  Fluorine
68 Herbium

#Discovery of false element
Nebulium
Coronium
Davyum
Decipium
Austrium

#Proof of false element
Nebulium
Coronium
Davyum
Decipium
Austrium

###SPECTROSCOPIC ANALYSIS AND MODERN PHYSICS###

#Theorisation
89 Actinium
61 Promethium
43 Technetium*
85 Astatine
91 Protactinium*
72 Hafnium
87 Francium*

#Discovery
90 Thorium
60 Neodymium
65 Terbium
70 Ytterbium
59 Praseodymium
66 Dysprosium
63 Europium
84 Polonium
88 Radium

#Validation
55 Caesium
37 Rubidium
81 Tallium
49 Indium
2 Helium
31 Gallium
67 Holmium
69 Thulium
62 Samarium
64 Gadolinium
32 Germanium
18 Argon
36 Krypton
10 Neon
54 Xenon

#Discovery of false element
Gnomium
Lucium
Victorium
Monium
Berzelium
Carolinium
Nipponium

#Proof of false
Gnomium
Lucium
Victorium
Monium
Berzelium
Carolinium


###SPECTROSCOPY ANALYSIS AND NUCLEAR PHYSICS###

#Discovery
89 Actinium
61 Promethium
85 Astatine
75 Rhenium
91 Protactinium
72 Hafnium
87 Francium
43 Technetium

#Validation 
90 Thorium
60 Neodymium
65 Terbium
70 Ytterbium
59 Praseodymium
66 Dysprosium
63 Europium
84 Polonium
88 Radium

#Discovery of false element
Neutronium

#Proof of false
None

###CYCLOTRONE###

#Discovery

#Validation
72 Hafnium
43 Technetium
87 Francium

#Discovery of false element
None

#Proof of false element
Neutronium
Nipponium