Tabl Cyfnodol yr Elfennau

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    15Elfen Grŵp 15
    16Chalcogen
    17Halogenau
    18
    Lliw
    Scale
    s
    block
    p
    block
    d
    block
    f
    block
    1s
    2s
    3s
    4s
    5s
    6s
    7s
    2p
    3p
    4p
    5p
    6p
    7p
    3d
    4d
    5d
    6d
    4f
    5f
    Atomic Symbol EnwPwysau
    1
  1. 1 H Hydrogen1.008
  2. 2 He Heliwm4.0026
    3. 2
  3. 3 Li Lithiwm6.94
  4. 4 Be Beriliwm9.0122
  5. 5 B Boron10.81
  6. 6 C Carbon12.011
  7. 7 N Nitrogen14.007
  8. 8 O Ocsigen15.999
  9. 9 F Fflworin18.998
  10. 10 Ne Neon20.180
    11. 3
  11. 11 Na Sodiwm22.990
  12. 12 Mg Magnesiwm24.305
  13. 13 Al Alwminiwm26.982
  14. 14 Si Silicon28.085
  15. 15 P Ffosfforws30.974
  16. 16 S Sylffwr32.06
  17. 17 Cl Clorin35.45
  18. 18 Ar Argon39.948
    19. 4
  19. 19 K Potasiwm39.098
  20. 20 Ca Calsiwm40.078
  21. 21 Sc Scandiwm44.956
  22. 22 Ti Titaniwm47.867
  23. 23 V Fanadiwm50.942
  24. 24 Cr Cromiwm51.996
  25. 25 Mn Manganîs54.938
  26. 26 Fe Haearn55.845
  27. 27 Co Cobalt58.933
  28. 28 Ni Nicel58.693
  29. 29 Cu Copr63.546
  30. 30 Zn Sinc65.38
  31. 31 Ga Galiwm69.723
  32. 32 Ge Germaniwm72.630
  33. 33 As Arsenig74.922
  34. 34 Se Seleniwm78.971
  35. 35 Br Bromin79.904
  36. 36 Kr Crypton83.798
    37. 5
  37. 37 Rb Rwbidiwm85.468
  38. 38 Sr Strontiwm87.62
  39. 39 Y Ytriwm88.906
  40. 40 Zr Sirconiwm91.224
  41. 41 Nb Niobiwm92.906
  42. 42 Mo Molybdenwm95.95
  43. 43 Tc Technetiwm(98)
  44. 44 Ru Rwtheniwm101.07
  45. 45 Rh Rhodiwm102.91
  46. 46 Pd Paladiwm106.42
  47. 47 Ag Arian107.87
  48. 48 Cd Cadmiwm112.41
  49. 49 In Indiwm114.82
  50. 50 Sn Tun118.71
  51. 51 Sb Antimoni121.76
  52. 52 Te Telwriwm127.60
  53. 53 I Ïodin126.90
  54. 54 Xe Senon131.29
    55. 6
  55. 55 Cs Cesiwm132.91
  56. 56 Ba Bariwm137.33
    57. 57–71
    6
  57. 57 La Lanthanwm138.91
  58. 58 Ce Ceriwm140.12
  59. 59 Pr Praseodymiwm140.91
  60. 60 Nd Neodymiwm144.24
  61. 61 Pm Promethiwm(145)
  62. 62 Sm Samariwm150.36
  63. 63 Eu Ewropiwm151.96
  64. 64 Gd Gadoliniwm157.25
  65. 65 Tb Terbiwm158.93
  66. 66 Dy Dysprosiwm162.50
  67. 67 Ho Holmiwm164.93
  68. 68 Er Erbiwm167.26
  69. 69 Tm Thwliwm168.93
  70. 70 Yb Yterbiwm173.05
  71. 71 Lu Lwtetiwm174.97
  72. 72 Hf Hafniwm178.49
  73. 73 Ta Tantalwm180.95
  74. 74 W Twngsten183.84
  75. 75 Re Rheniwm186.21
  76. 76 Os Osmiwm190.23
  77. 77 Ir Iridiwm192.22
  78. 78 Pt Platinwm195.08
  79. 79 Au Aur196.97
  80. 80 Hg Mercwri200.59
  81. 81 Tl Thaliwm204.38
  82. 82 Pb Plwm207.2
  83. 83 Bi Bismwth208.98
  84. 84 Po Poloniwm(209)
  85. 85 At Astatin(210)
  86. 86 Rn Radon(222)
    87. 7
  87. 87 Fr Ffransiwm(223)
  88. 88 Ra Radiwm(226)
    89. 89–103
    7
  89. 89 Ac Actiniwm(227)
  90. 90 Th Thoriwm232.04
  91. 91 Pa Protactiniwm231.04
  92. 92 U Wraniwm238.03
  93. 93 Np Neptwniwm(237)
  94. 94 Pu Plwtoniwm(244)
  95. 95 Am Americiwm(243)
  96. 96 Cm Curiwm(247)
  97. 97 Bk Berkeliwm(247)
  98. 98 Cf Califforniwm(251)
  99. 99 Es Einsteiniwm(252)
  100. 100 Fm Ffermiwm(257)
  101. 101 Md Mendelefiwm(258)
  102. 102 No Nobeliwm(259)
  103. 103 Lr Lawrenciwm(266)
  104. 104 Rf Rutherfordiwm(267)
  105. 105 Db Dubniwm(268)
  106. 106 Sg Seaborgiwm(269)
  107. 107 Bh Bohriwm(270)
  108. 108 Hs Hasiwm(277)
  109. 109 Mt Meitneriwm(278)
  110. 110 Ds Darmstadtiwm(281)
  111. 111 Rg Roentgeniwm(282)
  112. 112 Cn Coperniciwm(285)
  113. 113 Nh Nihoniwm(286)
  114. 114 Fl Fflerofiwm(289)
  115. 115 Mc Moscofiwm(290)
  116. 116 Lv Lifermoriwm(293)
  117. 117 Ts Tennessin(294)
  118. 118 Og Oganesson(294)
    119. Am elfennau heb isotopau sefydlog, gosodir rhif màs yr isotop â'r hanner-oes hirraf mewn cromfachau.