Chemical elements of the fifth period

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The fifth period of the periodic table of the elements contains all chemical elements that have exactly five electron shells in the atom . The innermost (first) electron shell is fully occupied and has two electrons . The second electron shell with 8 electrons and the third electron shell with 18 electrons are also fully occupied. The fourth electron shell has at least eight electrons and can hold a maximum of 18 electrons. The outermost (fifth) electron shell, also called the valence shell , can hold between one and eight electrons. Thus there are a total of 18 chemical elements in the fifth period.

Extract from the periodic table

group 1 2 3 4th 5 6th 7th 8th 9 10 11 12 13 14th 15th 16 17th 18th
I. II   III IV V VI VII VIII
Atomic number
symbol 		37
Rb 		38
Sr 		39
Y 		40
Zr 		41
Nb 		42
Mon 		43
Tc 		44
Ru 		45
Rh 		46
Pd 		47
Ag 		48
Cd 		49
in 		50
Sn 		51
Sb 		52
te 		53
I. 		54
Xe


0000 Alkali metals Alkaline earth metals Transition metals other metals Semi-metals Halogens Noble gases

Magic number

The chemical element tin with atomic number 50 has a higher stability in the basic state of the atomic nucleus than neighboring nuclides . This particular ordinal number is known as the magic number .

Number of electrons in the electron shells

Electron shell Number of electrons comment
All in all s orbital p orbital d orbital f orbital
1 2 2 - - - innermost electron shell
2 8th 2 6th - -
3 18th 2 6th 10 -
4th 8 to 18 2 6th 0 to 10 -
5 1 to 8 1 to 2 0 to 6 - - outermost electron shell , valence shell

list

Atomic number symbol Surname Element category Physical state Electron configuration
37 Rb Rubidium Alkali metals firmly [ Kr ] 5s 1
38 Sr strontium Alkaline earth metals firmly [Kr] 5s 2
39 Y yttrium Transition metals firmly [Kr] 4d 1 5s 2
40 Zr Zirconium Transition metals firmly [Kr] 4d 2 5s 2
41 Nb niobium Transition metals firmly [Kr] 4d 4 5s 1
42 Mon molybdenum Transition metals firmly [Kr] 4d 5 5s 1
43 Tc Technetium Transition metals firmly [Kr] 4d 5 5s 2
44 Ru Ruthenium Transition metals firmly [Kr] 4d 7 5s 1
45 Rh Rhodium Transition metals firmly [Kr] 4d 8 5s 1
46 Pd palladium Transition metals firmly [Kr] 4d 10 5s 0
47 Ag silver Transition metals firmly [Kr] 4d 10 5s 1
48 CD cadmium Transition metals firmly [Kr] 4d 10 5s 2
49 In Indium other metals firmly [Kr] 4d 10 5s 2 5p 1
50 Sn tin other metals firmly [Kr] 4d 10 5s 2 5p 2
51 Sb antimony Semi-metals firmly [Kr] 4d 10 5s 2 5p 3
52 Te Tellurium Semi-metals firmly [Kr] 4d 10 5s 2 5p 4
53 I. Iodine Halogens firmly [Kr] 4d 10 5s 2 5p 5
54 Xe xenon Noble gases gaseous [Kr] 4d 10 5s 2 5p 6