Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner 1 Atomic # 2$ 2 1 4 N Weight 2 2 2 8 1 12 2 8 2 K 9.0122 E 21 2 8 9 2 22 2 8 10 2 23 2 8 11 2 24 E 2 8 13 1 Alkaline earth metals 25 2 8 13 2 26 2 8 14 2 A Co 27 T 2 8 15 2 Ni 28 P 2 8 16 2 Cu 29 M % N 2 8 18 1 Nonmetals % Zn 30 G 2 8 18 8 1 38 2 8 18 8 2 39 2 8 18 9 2 40 2 8 18 10 2 41 2 8 18 12 1 42 2 8 18 13 1 43 2 8 18 13 2 44 2 8 18 15 1 45 2 8 18 16 1 46 2 8 18 18 47 56 2 8 18 18 8 2 K (226) (223) E 2 8 18 32 18 8 2 Ra 7 Fr Francium Radium 88 2 8 18 32 18 8 1 87 Ta W 74 2 8 18 32 12 2 Re 75 T (98) 2 8 18 18 2 2 8 18 32 32 10 2 Db 105 2 8 18 32 32 11 2 Sg 106 2 8 18 32 32 12 2 Bh 107 2 8 5 2 5 O 8 2 8 6 2 6 F 9 2 8 7 2 7 Ne 10 2 8 Ga 31 In 49 2 8 18 18 3 2 8 18 3 Si 14 Ge 32 Sn 50 2 8 18 18 4 2 8 18 4 P 15 As 33 Sb 51 2 8 18 18 5 2 8 18 5 S 16 Se 34 Te 52 2 8 18 18 6 2 8 18 6 Cl 17 Br 35 I 53 2 8 18 18 7 2 8 18 7 Ar 18 2 8 8 Kr 36 Xe 54 2 8 18 18 8 2 8 18 8 2 8 18 32 13 2 Os 76 2 8 18 32 14 2 Ir 77 2 8 18 32 15 2 Pt 78 2 8 18 32 17 1 Au 79 2 8 18 32 18 1 Hg 80 2 8 18 32 18 2 Tl 81 2 8 18 32 18 3 Pb 82 2 8 18 32 32 13 2 Hs 108 2 8 18 32 32 14 2 Mt 109 2 8 18 32 32 15 2 Ds 110 2 8 18 32 32 17 1 Rg 111 2 8 18 32 32 18 1 Cn 112 2 8 18 32 32 18 2 Nh 113 2 8 18 32 32 18 3 Fl 114 2 8 18 32 32 18 4 Bi 83 Mc 115 2 8 18 32 32 18 5 2 8 18 32 18 5 Po 84 Lv 116 2 8 18 32 32 18 6 2 8 18 32 18 6 At 85 Ts 117 2 8 18 32 32 18 7 2 8 18 32 18 7 Rn 86 Og 118 2 8 18 32 32 18 8 2 8 18 32 18 8 Bismuth Polonium Astatine Radon P 208.98 P (209) P (210) M (222) G 2 8 18 32 18 4 57 2 8 18 18 9 2 58 2 8 18 19 9 2 59 2 8 18 21 8 2 60 2 8 18 22 8 2 61 2 8 18 23 8 2 62 2 8 18 24 8 2 63 2 8 18 25 8 2 64 2 8 18 25 9 2 65 2 8 18 27 8 2 66 2 8 18 28 8 2 67 2 8 18 29 8 2 68 2 8 18 30 8 2 69 For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses. 2 8 18 31 8 2 70 2 8 18 32 8 2 71 2 8 18 32 9 2 Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson (267) T (268) T (269) T (270) T (277) T (278) (281) (282) (285) T (286) (289) P (290) (293) (294) (294) Rf 104 N 7 2 Helium 4.0026 G He 2 $ Aluminium Silicon Phosphorus Sulfur Chlorine Argon 26.982 P 28.085 M 30.974 N 32.06 N 35.45 N 39.948 G Al 13 Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury Thallium Lead 178.49 T 180.95 T 183.84 T 186.21 T 190.23 T 192.22 T 195.08 T 196.97 T 200.59 T 204.38 P 207.2 Hf 73 2 8 18 32 11 2 Cd 48 2 8 4 2 4 Halogens $ 90 2 8 18 32 18 10 2 91 2 8 18 32 20 9 2 92 2 8 18 32 21 9 2 93 94 2 8 18 32 24 8 2 95 2 8 18 32 25 8 2 96 2 8 18 32 25 9 2 97 2 8 18 32 27 8 2 98 2 8 18 32 28 8 2 99 2 8 18 32 29 8 2 100 2 8 18 32 30 8 2 101 2 8 18 32 31 8 2 102 2 8 18 32 32 8 2 103 2 8 18 32 32 8 3 L 150.36 L 151.96 L 157.25 L 158.93 L 162.50 L 164.93 L 167.26 L 168.93 L 173.05 L 174.97 L 2 8 18 32 22 9 2 (227) A 232.04 A 231.04 A 238.03 A (237) A (244) A (243) A (247) A (247) A (251) A (252) A (257) A (258) A (259) A (266) A Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 7 Ac Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium 89 2 8 18 32 18 9 2 138.91 L 140.12 L 140.91 L 144.24 L (145) Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 6 La Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium 89–103 57–71 72 2 8 18 32 10 2 E 88.906 T 91.224 T 92.906 T 95.95 132.91 K 137.33 E Ba 6 Cs Caesium Barium 55 2 8 18 18 8 1 85.468 K 87.62 2 8 18 18 1 C 6 $ Pnictogens Chalcogens $ Gallium Germanium Arsenic Selenium Bromine Krypton T 69.723 P 72.630 M 74.922 M 78.971 N 79.904 N 83.798 G 2 8 18 2 2 8 3 2 3 $ Boron Carbon Nitrogen Oxygen Fluorine Neon 10.81 M 12.011 N 14.007 N 15.999 N 18.998 N 20.180 G B 5 $ Cadmium Indium Tin Antimony Tellurium Iodine Xenon T 101.07 T 102.91 T 106.42 T 107.87 T 112.41 T 114.82 P 118.71 P 121.76 M 127.60 M 126.90 N 131.29 G Sr Y Zr Nb Mo Tc Ru Rh Pd Ag 5 Rb Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver 37 Cobalt Nickel Copper Zinc 39.098 K 40.078 E 44.956 T 47.867 T 50.942 T 51.996 T 54.938 T 55.845 T 58.933 T 58.693 T 63.546 T 65.38 Ca Sc Ti V Cr Mn Fe 4 K Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron 2 8 8 2 Alkali metals K Actinoids (Actinides) Lanthanoids (Lanthanides) L % Metals 7% Transition metals 20 6% Post-transition metals 2 8 8 1 Rf Unknown H Gas Hg Liquid 5% Metalloids 19 4% C Solid 3% Other nonmetals 22.990 K 24.305 E Mg 3 Na Sodium Magnesium 11 6.94 Be 2 Li Lithium Beryllium 3 1.008 Symbol 1 H Hydrogen Name 1 $ ^3(5,2',&7$%/(2)(/(0(176` Noble gases K L M N O P Q K L M N O P Q K L M N O P Q K L M N O P Q K L M N O P Q K L M N O P Q K L M N O P Q Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned 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