The chemical elements represented by their samples, which are sorted by atomic number. Follow the given links to their articles. There is an alternative sorting at Electron shell.

period 1

• 
  hydrogen - H - 1
• 
  helium - He - 2

period 2

• 
  lithium - Li - 3
• 
  beryllium - Be - 4
• 
  boron - B - 5
• 
  carbon - C - 6
• 
  nitrogen - N - 7
• 
  oxygen - O - 8
• 
  fluorine - F - 9
• 
  neon - Ne - 10

period 3

• 
  sodium - Na - 11
• 
  magnesium - Mg - 12
• 
  aluminium - Al - 13
• 
  silicon - Si - 14
• 
  phosphorus - P - 15
• 
  sulfur - S - 16
• 
  chlorine - Cl - 17
• 
  argon - Ar - 18

period 4

• 
  potassium - K - 19
• 
  calcium - Ca - 20
• 
  scandium - Sc - 21
• 
  titanium - Ti - 22
• 
  vanadium - V - 23
• 
  chromium - Cr - 24
• 
  manganese - Mn - 25
• 
  iron - Fe - 26
• 
  cobalt - Co - 27
• 
  nickel - Ni - 28
• 
  copper - Cu - 29
• 
  zinc - Zn - 30
• 
  gallium - Ga - 31
• 
  germanium - Ge - 32
• 
  arsenic - As - 33
• 
  selenium - Se - 34
• 
  bromine - Br - 35
• 
  krypton - Kr - 36

period 5

• 
  rubidium - Rb - 37
• 
  strontium - Sr - 38
• 
  yttrium - Y - 39
• 
  zirconium - Zr - 40
• 
  niobium - Nb - 41
• 
  molybdenum - Mo - 42
• 
  technetium - Tc - 43
• 
  ruthenium - Ru - 44
• 
  rhodium - Rh - 45
• 
  palladium - Pd - 46
• 
  silver - Ag - 47
• 
  cadmium - Cd - 48
• 
  indium - In - 49
• 
  tin - Sn - 50
• 
  antimony - Sb - 51
• 
  tellurium - Te - 52
• 
  iodine - I - 53
• 
  xenon - Xe - 54

period 6

• 
  caesium - Cs - 55
• 
  barium - Ba - 56
• 
  lanthanum - La - 57
• 
  cerium - Ce - 58
• 
  praseodymium - Pr - 59
• 
  neodymium - Nd - 60
• 
  promethium - Pm - 61
• 
  samarium - Sm - 62
• 
  europium - Eu - 63
• 
  gadolinium - Gd - 64
• 
  terbium - Tb - 65
• 
  dysprosium - Dy - 66
• 
  holmium - Ho - 67
• 
  erbium - Er - 68
• 
  thulium - Tm - 69
• 
  ytterbium - Yb - 70
• 
  lutetium - Lu - 71
• 
  hafnium - Hf - 72
• 
  tantalum - Ta - 73
• 
  tungsten - W - 74
• 
  rhenium - Re - 75
• 
  osmium - Os - 76
• 
  iridium - Ir - 77
• 
  platinum - Pt - 78
• 
  gold - Au - 79
• 
  mercury - Hg - 80
• 
  thallium - Tl - 81
• 
  lead - Pb - 82
• 
  bismuth - Bi - 83
• 
  polonium - Po - 84
• 
  astatine - At - 85
• 
  radon - Rn - 86

period 7

• 
  francium - Fr - 87
• 
  radium - Ra - 88
• 
  actinium - Ac - 89
• 
  thorium - Th - 90
• 
  protactinium - Pa - 91
• 
  uranium - U - 92
• 
  neptunium - Np - 93
• 
  plutonium - Pu - 94
• 
  americium - Am - 95
• 
  curium - Cm - 96
• 
  berkelium - Bk - 97
• 
  californium - Cf - 98
• 
  einsteinium - Es - 99
• 
  fermium - Fm - 100
• 
  mendelevium - Md - 101
• 
  nobelium - No - 102
• 
  lawrencium - Lr - 103
• 
  rutherfordium - Rf - 104
• 
  dubnium - Db - 105
• 
  seaborgium - Sg - 106
• 
  bohrium - Bh - 107
• 
  hassium - Hs - 108
• 
  meitnerium - Mt - 109
• 
  darmstadtium - Ds - 110
• 
  roentgenium - Rg - 111
• 
  copernicium - Cn - 112
• 
  nihonium - Nh - 113
• 
  flerovium - Fl - 114
• 
  moscovium - Mc - 115
• 
  livermorium - Lv - 116
• 
  tennessine - Ts - 117
• 
  oganesson - Og - 118