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- 1 H Hydrogen 1.008
- 2 He Heliwm 4.0026
- 3 Li Lithiwm 6.94
- 4 Be Beriliwm 9.0122
- 5 B Boron 10.81
- 6 C Carbon 12.011
- 7 N Nitrogen 14.007
- 8 O Ocsigen 15.999
- 9 F Fflworin 18.998
- 10 Ne Neon 20.180
- 11 Na Sodiwm 22.990
- 12 Mg Magnesiwm 24.305
- 13 Al Alwminiwm 26.982
- 14 Si Silicon 28.085
- 15 P Ffosfforws 30.974
- 16 S Sylffwr 32.06
- 17 Cl Clorin 35.45
- 18 Ar Argon 39.948
- 19 K Potasiwm 39.098
- 20 Ca Calsiwm 40.078
- 21 Sc Scandiwm 44.956
- 22 Ti Titaniwm 47.867
- 23 V Fanadiwm 50.942
- 24 Cr Cromiwm 51.996
- 25 Mn Manganîs 54.938
- 26 Fe Haearn 55.845
- 27 Co Cobalt 58.933
- 28 Ni Nicel 58.693
- 29 Cu Copr 63.546
- 30 Zn Sinc 65.38
- 31 Ga Galiwm 69.723
- 32 Ge Germaniwm 72.630
- 33 As Arsenig 74.922
- 34 Se Seleniwm 78.971
- 35 Br Bromin 79.904
- 36 Kr Crypton 83.798
- 37 Rb Rwbidiwm 85.468
- 38 Sr Strontiwm 87.62
- 39 Y Ytriwm 88.906
- 40 Zr Sirconiwm 91.224
- 41 Nb Niobiwm 92.906
- 42 Mo Molybdenwm 95.95
- 43 Tc Technetiwm (98)
- 44 Ru Rwtheniwm 101.07
- 45 Rh Rhodiwm 102.91
- 46 Pd Paladiwm 106.42
- 47 Ag Arian 107.87
- 48 Cd Cadmiwm 112.41
- 49 In Indiwm 114.82
- 50 Sn Tun 118.71
- 51 Sb Antimoni 121.76
- 52 Te Telwriwm 127.60
- 53 I Ïodin 126.90
- 54 Xe Senon 131.29
- 55 Cs Cesiwm 132.91
- 56 Ba Bariwm 137.33
- 57 La Lanthanwm 138.91
- 58 Ce Ceriwm 140.12
- 59 Pr Praseodymiwm 140.91
- 60 Nd Neodymiwm 144.24
- 61 Pm Promethiwm (145)
- 62 Sm Samariwm 150.36
- 63 Eu Ewropiwm 151.96
- 64 Gd Gadoliniwm 157.25
- 65 Tb Terbiwm 158.93
- 66 Dy Dysprosiwm 162.50
- 67 Ho Holmiwm 164.93
- 68 Er Erbiwm 167.26
- 69 Tm Thwliwm 168.93
- 70 Yb Yterbiwm 173.05
- 71 Lu Lwtetiwm 174.97
- 72 Hf Hafniwm 178.49
- 73 Ta Tantalwm 180.95
- 74 W Twngsten 183.84
- 75 Re Rheniwm 186.21
- 76 Os Osmiwm 190.23
- 77 Ir Iridiwm 192.22
- 78 Pt Platinwm 195.08
- 79 Au Aur 196.97
- 80 Hg Mercwri 200.59
- 81 Tl Thaliwm 204.38
- 82 Pb Plwm 207.2
- 83 Bi Bismwth 208.98
- 84 Po Poloniwm (209)
- 85 At Astatin (210)
- 86 Rn Radon (222)
- 87 Fr Ffransiwm (223)
- 88 Ra Radiwm (226)
- 89 Ac Actiniwm (227)
- 90 Th Thoriwm 232.04
- 91 Pa Protactiniwm 231.04
- 92 U Wraniwm 238.03
- 93 Np Neptwniwm (237)
- 94 Pu Plwtoniwm (244)
- 95 Am Americiwm (243)
- 96 Cm Curiwm (247)
- 97 Bk Berkeliwm (247)
- 98 Cf Califforniwm (251)
- 99 Es Einsteiniwm (252)
- 100 Fm Ffermiwm (257)
- 101 Md Mendelefiwm (258)
- 102 No Nobeliwm (259)
- 103 Lr Lawrenciwm (266)
- 104 Rf Rutherfordiwm (267)
- 105 Db Dubniwm (268)
- 106 Sg Seaborgiwm (269)
- 107 Bh Bohriwm (270)
- 108 Hs Hasiwm (277)
- 109 Mt Meitneriwm (278)
- 110 Ds Darmstadtiwm (281)
- 111 Rg Roentgeniwm (282)
- 112 Cn Coperniciwm (285)
- 113 Nh Nihoniwm (286)
- 114 Fl Fflerofiwm (289)
- 115 Mc Moscofiwm (290)
- 116 Lv Lifermoriwm (293)
- 117 Ts Tennessin (294)
- 118 Og Oganesson (294)
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18
1s
2s
3s
4s
5s
6s
7s
2p
3p
4p
5p
6p
7p
3d
4d
5d
6d
4f
5f
Atomic
Symbol
Enw
Pwysau
1
2
3
4
5
6
57–71
6
7
89–103
7
Am elfennau heb isotopau sefydlog, gosodir rhif màs yr isotop â'r hanner-oes hirraf mewn cromfachau.