Chemical elements of the seventh period

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The seventh period of the periodic table of the elements contains all chemical elements that have exactly seven electron shells in the atom . The innermost (first) electron shell is fully occupied and has two electrons . The second electron shell with eight electrons, the third electron shell with 18 electrons and the fourth electron shell with 32 electrons are also fully occupied. The fifth electron shell has at least 18 electrons and can hold a maximum of 32 electrons. The sixth electron shell has at least 8 electrons and can hold a maximum of 18 electrons. The outermost (seventh) electron shell, also known as the valence shell , can hold between one and eight electrons. Thus there are a total of 32 chemical elements in the seventh period. The actinides represent a special group within this 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 		87
Fr 		88
Ra 		89-103 104
para 		105
Db 		106
Sg 		107
hours 		108
ms 		109
m 		110
Ds 		111
Rg 		112
cn 		113
Nh 		114
bottles 		115
Mc 		116
Lv 		117
Ts 		118
above
 
Actinoids 89
Ac 		90
th 		91
Pa 		92
U 		93
Np 		94
Pu 		95
am 		96
cm 		97
Bk 		98
Cf 		99
it 		100
m 		101
Md 		102
No. 		103
Lr
Alkali metals Alkaline earth metals Actinoids Transition metals Unknown

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 32 2 6th 10 14th
5 18 to 32 2 6th 10 0 to 14
6th 8 to 18 2 6th 0 to 10 -
7th 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
87 Fr. Francium Alkali metals firmly [ Rn ] 7s 1
88 Ra radium Alkaline earth metals firmly [Rn] 7s 2
89 Ac Actinium Actinoids firmly [Rn] 6d 1 7s 2
90 Th Thorium Actinoids firmly [Rn] 6d 2 7s 2
91 Pa Protactinium Actinoids firmly [Rn] 5f 2 6d 1 7s 2
92 U uranium Actinoids firmly [Rn] 5f 3 6d 1 7s 2
93 Np neptunium Actinoids firmly [Rn] 5f 4 6d 1 7s 2
94 Pooh plutonium Actinoids firmly [Rn] 5f 6 7s 2
95 At the Americium Actinoids firmly [Rn] 5f 7 7s 2
96 Cm Curium Actinoids firmly [Rn] 5f 7 6d 1 7s 2
97 Bk Berkelium Actinoids firmly [Rn] 5f 9 7s 2
98 Cf Californium Actinoids firmly [Rn] 5f 10 7s 2
99 It Einsteinium Actinoids firmly [Rn] 5f 11 7s 2
100 Fm Fermium Actinoids firmly [Rn] 5f 12 7s 2
101 Md Mendelevium Actinoids firmly [Rn] 5f 13 7s 2
102 No Nobelium Actinoids firmly [Rn] 5f 14 7s 2
103 Lr lawrencium Actinoids firmly [Rn] 5f 14 6d 1 7s 2 (?)
104 Rf Rutherfordium Transition metals [Rn] 5f 14 6d 2 7s 2 (?)
105 Db Dubnium Transition metals [Rn] 5f 14 6d 3 7s 2 (?)
106 Sg Seaborgium Transition metals [Rn] 5f 14 6d 4 7s 2
107 Bra Bohrium Transition metals [Rn] 5f 14 6d 5 7s 2 (?)
108 Hs Hassium Transition metals [Rn] 5f 14 6d 6 7s 2 (?)
109 Mt Meitnerium Unknown [Rn] 5f 14 6d 7 7s 2
110 Ds Darmstadtium Unknown [Rn] 5f 14 6d 8 7s 2
111 Rg Roentgenium Unknown [Rn] 5f 14 6d 10 7s 1 (?)
112 Cn Copernicium Transition metals a) [Rn] 5f 14 6d 10 7s 2 (?)
113 Nh Nihonium Unknown [Rn] 5f 14 6d 10 7s 2 7p 1
114 Fl Flerovium other metals [Rn] 5f 14 6d 10 7s 2 7p 2
115 Mc Moscovium Unknown [Rn] 5f 14 6d 10 7s 2 7p 3
116 Lv Livermorium Unknown [Rn] 5f 14 6d 10 7s 2 7p 4
117 Ts Tenness Unknown [Rn] 5f 14 6d 10 7s 2 7p 5
118 Above Oganesson Unknown [Rn] 5f 14 6d 10 7s 2 7p 6
a)Similar behavior to mercury .

Individual evidence

  1. ↑ Beat Gerber: Super-Heavy Element 112 chemically investigated - experimentally landed on the island of artificial elements. Science Information Service , May 31, 2006, accessed on March 10, 2014 .