Period 5
Period 5
Rubidium to xenon — the second transition series, featuring silver, tin and iodine.
Element count
18
First element
Z = 37
Last element
Z = 54
Period 5 mirrors the structure of period 4 with the 4d block. It contains everyday elements (silver, tin, iodine) and several electronic configuration anomalies (Mo, Ru, Rh, Pd, Ag) driven by the extra stability of half-filled and fully filled subshells.
Filling subshells
5s4d5p
18 elements
37Rb
Rubidium
Alkali metals · Period 5
38Sr
Strontium
Alkaline earth metals · Period 5
39Y
Yttrium
Transition metals · Period 5
40Zr
Zirconium
Transition metals · Period 5
41Nb
Niobium
Transition metals · Period 5
42Mo
Molybdène
Transition metals · Period 5
43Tc
Technétium
Transition metals · Period 5
44Ru
Ruthénium
Transition metals · Period 5
45Rh
Rhodium
Transition metals · Period 5
46Pd
Palladium
Transition metals · Period 5
47Ag
Argent
Transition metals · Period 5
48Cd
Cadmium
Transition metals · Period 5
49In
Indium
Post-transition metals · Period 5
50Sn
Étain
Post-transition metals · Period 5
51Sb
Antimoine
Metalloids · Period 5
52Te
Tellure
Metalloids · Period 5
53I
Iode
Halogens · Period 5
54Xe
Xénon
Noble gases · Period 5