Group I III II IV V VI VII H 4 3 Li 9 relative atomic mass 11 12 7 Na magnesium 19 20 Ca Sc 23 Ti V 24 Cr 25 26 Mn Fe 55 56 27 Co 28 Ni potassium calcium scandium titanium vanadium chromium manganese 37 38 39 40 41 42 43 rubidium strontium yttrium zirconium niobium molybdenum technetium ruthenium rhodium palladium 55 56 57–71 72 73 74 75 76 77 78 39 Rb 85 Cs 40 Sr 88 Ba caesium barium 87 88 133 Fr francium – 45 Y 89 lanthanoids 137 Ra 89–103 actinoids 91 Hf – Nb 93 Ta 52 Mo 96 W Tc – Re Cu Zn 64 65 iron cobalt nickel copper 44 45 46 47 Ru 101 Os 59 Rh 103 Ir 59 Pd Ag 106 108 Ne 19 20 fluorine 13 14 15 16 17 aluminium silicon phosphorus sulfur chlorine 31 32 33 34 35 Ga Si 28 Ge 14 P 31 As 16 S 32 Se Cl 35.5 Br zinc gallium germanium arsenic selenium bromine 48 49 50 51 52 53 Cd 70 In 73 Sn 75 Sb 79 Te 80 I silver cadmium indium 115 119 tin antimony tellurium iodine 79 80 81 82 83 84 85 Pt Au 112 Hg Tl Pb 122 Bi 128 Po 127 At 36 Kr krypton 84 54 Xe xenon 131 86 Rn iridium platinum 195 197 gold mercury thallium 204 207 lead bismuth polonium astatine radon 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 nihonium flerovium Rf www.cambridgeinternational.org/igcse 58 Ce Db dubnium – 59 Pr Sg seaborgium – 60 Nd Bh bohrium – 61 Pm 190 Hs hassium – 62 Sm 192 Mt meitnerium – 63 Eu Ds darmstadtium – 64 Gd Rg roentgenium – 65 Tb 201 Cn copernicium – 66 Dy Nh – 67 Ho Fl – 68 Er 209 Mc moscovium – 69 Tm – Lv livermorium – 70 Yb – Ts tennessine – 71 Lu neodymium promethium samarium europium gadolinium terbium dysprosium holmium erbium thulium ytterbium lutetium 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 nobelium lawrencium – 40 osmium 186 praseodymium actinium argon rhenium 184 cerium Ac 18 Ar tungsten 181 lanthanum 139 neon tantalum – La 51 30 F oxygen 12 10 hafnium rutherfordium 57 actinoids Zr 178 radium lanthanoids 48 29 O 9 nitrogen 27 22 N 8 carbon Al 21 C 7 boron 11 24 6 140 Th thorium 232 141 Pa protactinium 231 144 U uranium 238 – Np neptunium – 150 Pu plutonium – 152 157 Am Cm – – americium curium The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.). 159 Bk berkelium – 163 Cf californium – 165 Es einsteinium – 167 Fm fermium – 169 Md mendelevium – 173 No – 175 Lr – – Og oganesson – 47 Cambridge IGCSE Chemistry 0620 syllabus for 2023, 2024 and 2025. Details of the assessment K B name Mg sodium 23 4 5 atomic number atomic symbol beryllium helium 1 Be lithium He hydrogen Key VIII 2 1 The Periodic Table of Elements Back to contents page The Periodic Table of Elements