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Electron Configuration Flashcards: All 118 Elements

Practice neutral-atom ground-state electron configurations for every named element, with NIST-based shorthand and clearly labeled predictions.

Eftir höfund Open Study Contributor

Um þennan stokk

These 131 English flashcards practice neutral-atom ground-state electron configurations for all 118 currently named elements, from hydrogen through oganesson. Every element-to-configuration card includes the name, symbol, and atomic number. Thirteen extra reverse cards ask for the element behind a selected high-value irregular configuration.

What’s included

  • 118 element-to-configuration cards in noble-gas shorthand.
  • 13 configuration-to-element cards for Cr, Cu, Nb, Mo, Ru, Rh, Pd, Ag, Ce, Gd, Pt, Au, and Cm.
  • A sequence by increasing atomic number, with each reverse card placed at least six unrelated cards after its matching forward card.
  • The requested answer first on every back, with source qualifiers appended for lawrencium and the predicted elements 109–118.
  • NIST ASD ground-shell assignments through hassium. Meitnerium through oganesson are labeled as PubChem/LANL predictions; lawrencium follows NIST’s current 7p¹ assignment.

What’s excluded

The deck does not include full expanded configurations, ions, excited states, orbital-box diagrams, quantum numbers, derivation drills, oxidation states, or other element properties. It also avoids automatic reverse cards and separate name, symbol, and atomic-number permutations for every element.

Sources and reuse

The primary factual sources are the NIST Atomic Spectra Database, its ground-shell guidance, and the NIST periodic table. PubChem’s element pages expose property-level sources and provide the stated LANL prediction convention for elements 109–118. For roentgenium, this deck follows the exact PubChem element entry and LANL page, which both predict [Rn] 5f¹⁴ 6d⁹ 7s²; PubChem’s downloadable table instead lists [Rn] 5f¹⁴ 6d¹⁰ 7s¹. This documented source disagreement is not treated as a second accepted answer. IUPAC confirms the current names and symbols.

The questions, answers, selection, order, and cover were produced independently. No competitor cards, prose, tables, logos, or trade dress were copied. The CC0 label covers only the original wording, organization, metadata, and generated media that Open Study Contributor can license; it does not claim ownership of scientific facts or source material.

Spjöld í þessum stokki

  1. Spjald 1

    Spurning

    Hydrogen (H, Z=1) — neutral ground-state configuration

    Svar

    1s¹

  2. Spjald 2

    Spurning

    Helium (He, Z=2) — neutral ground-state configuration

    Svar

    1s²

  3. Spjald 3

    Spurning

    Lithium (Li, Z=3) — neutral ground-state configuration

    Svar

    [He] 2s¹

  4. Spjald 4

    Spurning

    Beryllium (Be, Z=4) — neutral ground-state configuration

    Svar

    [He] 2s²

  5. Spjald 5

    Spurning

    Boron (B, Z=5) — neutral ground-state configuration

    Svar

    [He] 2s² 2p¹

  6. Spjald 6

    Spurning

    Carbon (C, Z=6) — neutral ground-state configuration

    Svar

    [He] 2s² 2p²

  7. Spjald 7

    Spurning

    Nitrogen (N, Z=7) — neutral ground-state configuration

    Svar

    [He] 2s² 2p³

  8. Spjald 8

    Spurning

    Oxygen (O, Z=8) — neutral ground-state configuration

    Svar

    [He] 2s² 2p⁴

  9. Spjald 9

    Spurning

    Fluorine (F, Z=9) — neutral ground-state configuration

    Svar

    [He] 2s² 2p⁵

  10. Spjald 10

    Spurning

    Neon (Ne, Z=10) — neutral ground-state configuration

    Svar

    [He] 2s² 2p⁶

  11. Spjald 11

    Spurning

    Sodium (Na, Z=11) — neutral ground-state configuration

    Svar

    [Ne] 3s¹

  12. Spjald 12

    Spurning

    Magnesium (Mg, Z=12) — neutral ground-state configuration

    Svar

    [Ne] 3s²

  13. Spjald 13

    Spurning

    Aluminum (Al, Z=13) — neutral ground-state configuration

    Svar

    [Ne] 3s² 3p¹

  14. Spjald 14

    Spurning

    Silicon (Si, Z=14) — neutral ground-state configuration

    Svar

    [Ne] 3s² 3p²

  15. Spjald 15

    Spurning

    Phosphorus (P, Z=15) — neutral ground-state configuration

    Svar

    [Ne] 3s² 3p³

  16. Spjald 16

    Spurning

    Sulfur (S, Z=16) — neutral ground-state configuration

    Svar

    [Ne] 3s² 3p⁴

  17. Spjald 17

    Spurning

    Chlorine (Cl, Z=17) — neutral ground-state configuration

    Svar

    [Ne] 3s² 3p⁵

  18. Spjald 18

    Spurning

    Argon (Ar, Z=18) — neutral ground-state configuration

    Svar

    [Ne] 3s² 3p⁶

  19. Spjald 19

    Spurning

    Potassium (K, Z=19) — neutral ground-state configuration

    Svar

    [Ar] 4s¹

  20. Spjald 20

    Spurning

    Calcium (Ca, Z=20) — neutral ground-state configuration

    Svar

    [Ar] 4s²

  21. Spjald 21

    Spurning

    Scandium (Sc, Z=21) — neutral ground-state configuration

    Svar

    [Ar] 3d¹ 4s²

  22. Spjald 22

    Spurning

    Titanium (Ti, Z=22) — neutral ground-state configuration

    Svar

    [Ar] 3d² 4s²

  23. Spjald 23

    Spurning

    Vanadium (V, Z=23) — neutral ground-state configuration

    Svar

    [Ar] 3d³ 4s²

  24. Spjald 24

    Spurning

    Chromium (Cr, Z=24) — neutral ground-state configuration

    Svar

    [Ar] 3d⁵ 4s¹

  25. Spjald 25

    Spurning

    Manganese (Mn, Z=25) — neutral ground-state configuration

    Svar

    [Ar] 3d⁵ 4s²

  26. Spjald 26

    Spurning

    Iron (Fe, Z=26) — neutral ground-state configuration

    Svar

    [Ar] 3d⁶ 4s²

  27. Spjald 27

    Spurning

    Cobalt (Co, Z=27) — neutral ground-state configuration

    Svar

    [Ar] 3d⁷ 4s²

  28. Spjald 28

    Spurning

    Nickel (Ni, Z=28) — neutral ground-state configuration

    Svar

    [Ar] 3d⁸ 4s²

  29. Spjald 29

    Spurning

    Copper (Cu, Z=29) — neutral ground-state configuration

    Svar

    [Ar] 3d¹⁰ 4s¹

  30. Spjald 30

    Spurning

    Zinc (Zn, Z=30) — neutral ground-state configuration

    Svar

    [Ar] 3d¹⁰ 4s²

  31. Spjald 31

    Spurning

    Gallium (Ga, Z=31) — neutral ground-state configuration

    Svar

    [Ar] 3d¹⁰ 4s² 4p¹

  32. Spjald 32

    Spurning

    Neutral ground-state configuration: [Ar] 3d⁵ 4s¹

    Svar

    Chromium (Cr, Z=24).

  33. Spjald 33

    Spurning

    Germanium (Ge, Z=32) — neutral ground-state configuration

    Svar

    [Ar] 3d¹⁰ 4s² 4p²

  34. Spjald 34

    Spurning

    Arsenic (As, Z=33) — neutral ground-state configuration

    Svar

    [Ar] 3d¹⁰ 4s² 4p³

  35. Spjald 35

    Spurning

    Selenium (Se, Z=34) — neutral ground-state configuration

    Svar

    [Ar] 3d¹⁰ 4s² 4p⁴

  36. Spjald 36

    Spurning

    Bromine (Br, Z=35) — neutral ground-state configuration

    Svar

    [Ar] 3d¹⁰ 4s² 4p⁵

  37. Spjald 37

    Spurning

    Krypton (Kr, Z=36) — neutral ground-state configuration

    Svar

    [Ar] 3d¹⁰ 4s² 4p⁶

  38. Spjald 38

    Spurning

    Neutral ground-state configuration: [Ar] 3d¹⁰ 4s¹

    Svar

    Copper (Cu, Z=29).

  39. Spjald 39

    Spurning

    Rubidium (Rb, Z=37) — neutral ground-state configuration

    Svar

    [Kr] 5s¹

  40. Spjald 40

    Spurning

    Strontium (Sr, Z=38) — neutral ground-state configuration

    Svar

    [Kr] 5s²

  41. Spjald 41

    Spurning

    Yttrium (Y, Z=39) — neutral ground-state configuration

    Svar

    [Kr] 4d¹ 5s²

  42. Spjald 42

    Spurning

    Zirconium (Zr, Z=40) — neutral ground-state configuration

    Svar

    [Kr] 4d² 5s²

  43. Spjald 43

    Spurning

    Niobium (Nb, Z=41) — neutral ground-state configuration

    Svar

    [Kr] 4d⁴ 5s¹

  44. Spjald 44

    Spurning

    Molybdenum (Mo, Z=42) — neutral ground-state configuration

    Svar

    [Kr] 4d⁵ 5s¹

  45. Spjald 45

    Spurning

    Technetium (Tc, Z=43) — neutral ground-state configuration

    Svar

    [Kr] 4d⁵ 5s²

  46. Spjald 46

    Spurning

    Ruthenium (Ru, Z=44) — neutral ground-state configuration

    Svar

    [Kr] 4d⁷ 5s¹

  47. Spjald 47

    Spurning

    Rhodium (Rh, Z=45) — neutral ground-state configuration

    Svar

    [Kr] 4d⁸ 5s¹

  48. Spjald 48

    Spurning

    Palladium (Pd, Z=46) — neutral ground-state configuration

    Svar

    [Kr] 4d¹⁰

  49. Spjald 49

    Spurning

    Silver (Ag, Z=47) — neutral ground-state configuration

    Svar

    [Kr] 4d¹⁰ 5s¹

  50. Spjald 50

    Spurning

    Cadmium (Cd, Z=48) — neutral ground-state configuration

    Svar

    [Kr] 4d¹⁰ 5s²

  51. Spjald 51

    Spurning

    Indium (In, Z=49) — neutral ground-state configuration

    Svar

    [Kr] 4d¹⁰ 5s² 5p¹

  52. Spjald 52

    Spurning

    Tin (Sn, Z=50) — neutral ground-state configuration

    Svar

    [Kr] 4d¹⁰ 5s² 5p²

  53. Spjald 53

    Spurning

    Neutral ground-state configuration: [Kr] 4d⁴ 5s¹

    Svar

    Niobium (Nb, Z=41).

  54. Spjald 54

    Spurning

    Antimony (Sb, Z=51) — neutral ground-state configuration

    Svar

    [Kr] 4d¹⁰ 5s² 5p³

  55. Spjald 55

    Spurning

    Neutral ground-state configuration: [Kr] 4d⁵ 5s¹

    Svar

    Molybdenum (Mo, Z=42).

  56. Spjald 56

    Spurning

    Tellurium (Te, Z=52) — neutral ground-state configuration

    Svar

    [Kr] 4d¹⁰ 5s² 5p⁴

  57. Spjald 57

    Spurning

    Iodine (I, Z=53) — neutral ground-state configuration

    Svar

    [Kr] 4d¹⁰ 5s² 5p⁵

  58. Spjald 58

    Spurning

    Neutral ground-state configuration: [Kr] 4d⁷ 5s¹

    Svar

    Ruthenium (Ru, Z=44).

  59. Spjald 59

    Spurning

    Xenon (Xe, Z=54) — neutral ground-state configuration

    Svar

    [Kr] 4d¹⁰ 5s² 5p⁶

  60. Spjald 60

    Spurning

    Neutral ground-state configuration: [Kr] 4d⁸ 5s¹

    Svar

    Rhodium (Rh, Z=45).

  61. Spjald 61

    Spurning

    Cesium (Cs, Z=55) — neutral ground-state configuration

    Svar

    [Xe] 6s¹

  62. Spjald 62

    Spurning

    Barium (Ba, Z=56) — neutral ground-state configuration

    Svar

    [Xe] 6s²

  63. Spjald 63

    Spurning

    Neutral ground-state configuration: [Kr] 4d¹⁰

    Svar

    Palladium (Pd, Z=46).

  64. Spjald 64

    Spurning

    Lanthanum (La, Z=57) — neutral ground-state configuration

    Svar

    [Xe] 5d¹ 6s²

  65. Spjald 65

    Spurning

    Neutral ground-state configuration: [Kr] 4d¹⁰ 5s¹

    Svar

    Silver (Ag, Z=47).

  66. Spjald 66

    Spurning

    Cerium (Ce, Z=58) — neutral ground-state configuration

    Svar

    [Xe] 4f¹ 5d¹ 6s²

    Abstract atom with layered orbital paths around a luminous nucleus on a deep blue background.

    131 spjald

    Electron Configuration Flashcards: All 118 Elements

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    Nibomo opnast svo þú getir byrjað að læra.

  67. Spjald 67

    Spurning

    Praseodymium (Pr, Z=59) — neutral ground-state configuration

    Svar

    [Xe] 4f³ 6s²

  68. Spjald 68

    Spurning

    Neodymium (Nd, Z=60) — neutral ground-state configuration

    Svar

    [Xe] 4f⁴ 6s²

  69. Spjald 69

    Spurning

    Promethium (Pm, Z=61) — neutral ground-state configuration

    Svar

    [Xe] 4f⁵ 6s²

  70. Spjald 70

    Spurning

    Samarium (Sm, Z=62) — neutral ground-state configuration

    Svar

    [Xe] 4f⁶ 6s²

  71. Spjald 71

    Spurning

    Europium (Eu, Z=63) — neutral ground-state configuration

    Svar

    [Xe] 4f⁷ 6s²

  72. Spjald 72

    Spurning

    Gadolinium (Gd, Z=64) — neutral ground-state configuration

    Svar

    [Xe] 4f⁷ 5d¹ 6s²

  73. Spjald 73

    Spurning

    Terbium (Tb, Z=65) — neutral ground-state configuration

    Svar

    [Xe] 4f⁹ 6s²

  74. Spjald 74

    Spurning

    Dysprosium (Dy, Z=66) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁰ 6s²

  75. Spjald 75

    Spurning

    Neutral ground-state configuration: [Xe] 4f¹ 5d¹ 6s²

    Svar

    Cerium (Ce, Z=58).

  76. Spjald 76

    Spurning

    Holmium (Ho, Z=67) — neutral ground-state configuration

    Svar

    [Xe] 4f¹¹ 6s²

  77. Spjald 77

    Spurning

    Erbium (Er, Z=68) — neutral ground-state configuration

    Svar

    [Xe] 4f¹² 6s²

  78. Spjald 78

    Spurning

    Thulium (Tm, Z=69) — neutral ground-state configuration

    Svar

    [Xe] 4f¹³ 6s²

  79. Spjald 79

    Spurning

    Ytterbium (Yb, Z=70) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 6s²

  80. Spjald 80

    Spurning

    Lutetium (Lu, Z=71) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d¹ 6s²

  81. Spjald 81

    Spurning

    Neutral ground-state configuration: [Xe] 4f⁷ 5d¹ 6s²

    Svar

    Gadolinium (Gd, Z=64).

  82. Spjald 82

    Spurning

    Hafnium (Hf, Z=72) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d² 6s²

  83. Spjald 83

    Spurning

    Tantalum (Ta, Z=73) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d³ 6s²

  84. Spjald 84

    Spurning

    Tungsten (W, Z=74) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d⁴ 6s²

  85. Spjald 85

    Spurning

    Rhenium (Re, Z=75) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d⁵ 6s²

  86. Spjald 86

    Spurning

    Osmium (Os, Z=76) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d⁶ 6s²

  87. Spjald 87

    Spurning

    Iridium (Ir, Z=77) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d⁷ 6s²

  88. Spjald 88

    Spurning

    Platinum (Pt, Z=78) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d⁹ 6s¹

  89. Spjald 89

    Spurning

    Gold (Au, Z=79) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d¹⁰ 6s¹

  90. Spjald 90

    Spurning

    Mercury (Hg, Z=80) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d¹⁰ 6s²

  91. Spjald 91

    Spurning

    Thallium (Tl, Z=81) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹

  92. Spjald 92

    Spurning

    Lead (Pb, Z=82) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p²

  93. Spjald 93

    Spurning

    Bismuth (Bi, Z=83) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³

  94. Spjald 94

    Spurning

    Polonium (Po, Z=84) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴

  95. Spjald 95

    Spurning

    Neutral ground-state configuration: [Xe] 4f¹⁴ 5d⁹ 6s¹

    Svar

    Platinum (Pt, Z=78).

  96. Spjald 96

    Spurning

    Astatine (At, Z=85) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵

  97. Spjald 97

    Spurning

    Radon (Rn, Z=86) — neutral ground-state configuration

    Svar

    [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶

  98. Spjald 98

    Spurning

    Neutral ground-state configuration: [Xe] 4f¹⁴ 5d¹⁰ 6s¹

    Svar

    Gold (Au, Z=79).

  99. Spjald 99

    Spurning

    Francium (Fr, Z=87) — neutral ground-state configuration

    Svar

    [Rn] 7s¹

  100. Spjald 100

    Spurning

    Radium (Ra, Z=88) — neutral ground-state configuration

    Svar

    [Rn] 7s²

  101. Spjald 101

    Spurning

    Actinium (Ac, Z=89) — neutral ground-state configuration

    Svar

    [Rn] 6d¹ 7s²

  102. Spjald 102

    Spurning

    Thorium (Th, Z=90) — neutral ground-state configuration

    Svar

    [Rn] 6d² 7s²

  103. Spjald 103

    Spurning

    Protactinium (Pa, Z=91) — neutral ground-state configuration

    Svar

    [Rn] 5f² 6d¹ 7s²

  104. Spjald 104

    Spurning

    Uranium (U, Z=92) — neutral ground-state configuration

    Svar

    [Rn] 5f³ 6d¹ 7s²

  105. Spjald 105

    Spurning

    Neptunium (Np, Z=93) — neutral ground-state configuration

    Svar

    [Rn] 5f⁴ 6d¹ 7s²

  106. Spjald 106

    Spurning

    Plutonium (Pu, Z=94) — neutral ground-state configuration

    Svar

    [Rn] 5f⁶ 7s²

  107. Spjald 107

    Spurning

    Americium (Am, Z=95) — neutral ground-state configuration

    Svar

    [Rn] 5f⁷ 7s²

  108. Spjald 108

    Spurning

    Curium (Cm, Z=96) — neutral ground-state configuration

    Svar

    [Rn] 5f⁷ 6d¹ 7s²

  109. Spjald 109

    Spurning

    Berkelium (Bk, Z=97) — neutral ground-state configuration

    Svar

    [Rn] 5f⁹ 7s²

  110. Spjald 110

    Spurning

    Californium (Cf, Z=98) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁰ 7s²

  111. Spjald 111

    Spurning

    Einsteinium (Es, Z=99) — neutral ground-state configuration

    Svar

    [Rn] 5f¹¹ 7s²

  112. Spjald 112

    Spurning

    Fermium (Fm, Z=100) — neutral ground-state configuration

    Svar

    [Rn] 5f¹² 7s²

  113. Spjald 113

    Spurning

    Mendelevium (Md, Z=101) — neutral ground-state configuration

    Svar

    [Rn] 5f¹³ 7s²

  114. Spjald 114

    Spurning

    Nobelium (No, Z=102) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 7s²

  115. Spjald 115

    Spurning

    Lawrencium (Lr, Z=103) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 7s² 7p¹ — NIST ASD.

  116. Spjald 116

    Spurning

    Rutherfordium (Rf, Z=104) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d² 7s²

  117. Spjald 117

    Spurning

    Neutral ground-state configuration: [Rn] 5f⁷ 6d¹ 7s²

    Svar

    Curium (Cm, Z=96).

  118. Spjald 118

    Spurning

    Dubnium (Db, Z=105) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d³ 7s²

  119. Spjald 119

    Spurning

    Seaborgium (Sg, Z=106) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d⁴ 7s²

  120. Spjald 120

    Spurning

    Bohrium (Bh, Z=107) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d⁵ 7s²

  121. Spjald 121

    Spurning

    Hassium (Hs, Z=108) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d⁶ 7s²

  122. Spjald 122

    Spurning

    Meitnerium (Mt, Z=109) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d⁷ 7s² — predicted by PubChem/LANL.

  123. Spjald 123

    Spurning

    Darmstadtium (Ds, Z=110) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d⁸ 7s² — predicted by PubChem/LANL.

  124. Spjald 124

    Spurning

    Roentgenium (Rg, Z=111) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d⁹ 7s² — predicted by PubChem/LANL.

  125. Spjald 125

    Spurning

    Copernicium (Cn, Z=112) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d¹⁰ 7s² — predicted by PubChem/LANL.

  126. Spjald 126

    Spurning

    Nihonium (Nh, Z=113) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹ — predicted by PubChem/LANL.

  127. Spjald 127

    Spurning

    Flerovium (Fl, Z=114) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p² — predicted by PubChem/LANL.

  128. Spjald 128

    Spurning

    Moscovium (Mc, Z=115) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p³ — predicted by PubChem/LANL.

  129. Spjald 129

    Spurning

    Livermorium (Lv, Z=116) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁴ — predicted by PubChem/LANL.

  130. Spjald 130

    Spurning

    Tennessine (Ts, Z=117) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵ — predicted by PubChem/LANL.

  131. Spjald 131

    Spurning

    Oganesson (Og, Z=118) — neutral ground-state configuration

    Svar

    [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶ — predicted by PubChem/LANL.

Abstract atom with layered orbital paths around a luminous nucleus on a deep blue background.

131 spjald

Electron Configuration Flashcards: All 118 Elements

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Nibomo opnast svo þú getir byrjað að læra.