The Rarest Element on Earth

While there are over a hundred known elements, the vast majority of the material on Earth is composed of just a handful of elements; oxygen, silicon, aluminum, to name a few. But what is the Earth lacking? What are the rarest elements on Earth?
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Here's the full list if you want to go through it:
8 Oxygen 4.61 x 105
14 Silicon 2.82 x 105
13 Aluminum 8.23 x 104
26 Iron 5.63 x 104
20 Calcium 4.15 x 104
11 Sodium 2.36 x 104
12 Magnesium 2.33 x 104
19 Potassium 2.09 x 104
22 Titanium 5.56 x 103
1 Hydrogen 1.40 x 103
15 Phosphorus 1.05 x 103
25 Manganese 950
9 Fluorine 585
56 Barium 425
38 Strontium 370
16 Sulfur 350
6 Carbon 200
40 Zirconium 165
17 Chlorine 145
23 Vanadium 120
24 Chromium 102
37 Rubidium 90
28 Nickel 84
30 Zinc 70
58 Cerium 66.5
29 Copper 60
60 Neodymium 41.5
57 Lanthanum 39
39 Yttrium 33
27 Cobalt 25
21 Scandium 22
3 Lithium 20
41 Niobium 20
7 Nitrogen 19
31 Gallium 19
82 Lead 14
5 Boron 10
90 Thorium 9.6
59 Praseodymium 9.2
62 Samarium 7.05
64 Gadolinium 6.2
66 Dysprosium 5.2
18 Argon 3.5
68 Erbium 3.5
70 Ytterbium 3.2
55 Cesium 3
72 Hafnium 3
4 Beryllium 2.8
92 Uranium 2.7
35 Bromine 2.4
50 Tin 2.3
63 Europium 2
73 Tantalum 2
33 Arsenic 1.8
32 Germanium 1.5
67 Holmium 1.3
74 Tungsten 1.25
42 Molybdenum 1.2
65 Terbium 1.2
81 Thallium 0.85
71 Lutetium 0.8
69 Thulium 0.52
53 Iodine 0.45
49 Indium 0.25
51 Antimony 0.2
48 Cadmium 0.15
80 Mercury 8.5 x 10-2
47 Silver 7.5 x 10-2
34 Selenium 5 x 10-2
46 Palladium 1.5 x 10-2
83 Bismuth 8.5 x 10-3
2 Helium 8 x 10-3
10 Neon 5 x 10-3
78 Platinum 5 x 10-3
79 Gold 4 x 10-3
76 Osmium 1.5 x 10-3
44 Ruthenium 1 x 10-3
45 Rhodium 1 x 10-3
52 Tellurium 1 x 10-3
77 Iridium 1 x 10-3
75 Rhenium 7 x 10-4
36 Krypton 1 x 10-4
54 Xenon 3 x 10-5
91 Protactinium 1.4 x 10-6
88 Radium 9 x 10-7
89 Actinium 5.5 x 10-10
84 Polonium 2 x 10-10
86 Radon 4 x 10-11
43 Technetium No Data
61 Promethium No Data
85 Astatine No Data
87 Francium No Data
93 Neptunium No Data
94 Plutonium No Data
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