A period 5 element is one of the chemical elements in the fifth row (or period) of the periodic table of the elements.
These are:
Group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
#
Name37
Rb38
Sr39
Y40
Zr41
Nb42
Mo43
Tc44
Ru45
Rh46
Pd47
Ag48
Cd49
In50
Sn51
Sb52
Te53
I54
Xe
e--conf.
Alkali metals Alkaline earths Lanthanide Actinides Transition metals Other metals Metalloids Nonmetals Halogens Noble gases