Electron configurations of the neutral gaseous atoms in the ground state | ||||||||||||||||||||||||||||||||
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1s: |
1 H 1 |
2 He 2 |
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[He] |
3 Li 1 |
4 Be 2 |
5 B 2 |
6 C 2 |
7 N 2 |
8 O 2 |
9 F 2 |
10 Ne 2 |
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[Ne] |
11 Na 1 |
12 Mg 2 |
13 Al 2 |
14 Si 2 |
15 P 2 |
16 S 2 |
17 Cl 2 |
18 Ar 2 |
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[Ar] |
19 K 1 |
20 Ca 2 |
21 Sc 2 |
22 Ti 2 |
23 V 2 |
24 Cr 1 |
25 Mn 2 |
26 Fe 2 |
27 Co 2 |
28 Ni 2 |
29 Cu 1 |
30 Zn 2 |
31 Ga 2 |
32 Ge 2 |
33 As 2 |
34 Se 2 |
35 Br 2 |
36 Kr 2 |
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[Kr] |
37 Rb 1 |
38 Sr 2 |
39 Y 2 |
40 Zr 2 |
41 Nb 1 |
42 Mo 1 |
43 Tc 2 |
44 Ru 1 |
45 Rh 1 |
46 Pd - |
47 Ag 1 |
48 Cd 2 |
49 In 2 |
50 Sn 2 |
51 Sb 2 |
52 Te 2 |
53 I 2 |
54 Xe 2 |
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[Xe] |
55 Cs 1 |
56 Ba 2 |
57 La 2 |
58 Ce 2 |
59 Pr 2 |
60 Nd 2 |
61 Pm 2 |
62 Sm 2 |
63 Eu 2 |
64 Gd 2 |
65 Tb 2 |
66 Dy 2 |
67 Ho 2 |
68 Er 2 |
69 Tm 2 |
70 Yb 2 |
71 Lu 2 |
72 Hf 2 |
73 Ta 2 |
74 W 2 |
75 Re 2 |
76 Os 2 |
77 Ir 2 |
78 Pt 1 |
79 Au 1 |
80 Hg 2 |
81 Tl 2 |
82 Pb 2 |
83 Bi 2 |
84 Po 2 |
85 At 2 |
86 Rn 2 |
[Rn] |
87 Fr 1 |
88 Ra 2 |
89 Ac 2 |
90 Th 2 |
91 Pa 2 |
92 U 2 |
93 Np 2 |
94 Pu 2 |
95 Am 2 |
96 Cm 2 |
97 Bk 2 |
98 Cf 2 |
99 Es 2 |
100 Fm 2 |
101 Md 2 |
102 No 2 |
103 Lr 2 |
104 Rf 2 |
105 Db 2 |
106 Sg 2 |
107 Bh 2 |
108 Hs 2 |
109 Mt 2 |
110 Ds 2 |
111 Rg 2 |
112 Cn 2 |
113 Uut 2 |
114 Fl 2 |
115 Uup 2 |
116 Lv 2 |
117 Uus 2 |
118 Uuo 2 |
Legend for the background color
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- Configurations of elements 103 and 104 are uncertain; those for elements 105 and above are not available. Predictions from reliable sources have been used for these elements.
- Grayed out electron numbers indicate subshells that are filled to their maximum.
- The bracketed noble gas symbols on the left represent the inner configurations that are the same in each period. Written out these are:
-
- He, 2, helium : 1s2
- Ne, 10, neon : 1s2 2s2 2p6
- Ar, 18, argon : 1s2 2s2 2p6 3s2 3p6
- Kr, 36, krypton : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
- Xe, 54, xenon : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6
- Rn, 86, radon : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6
- Uuo, 118, ununoctium : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6
- Note the non-linear shell ordering, which comes about due to the different energies of smaller and larger shells.
References
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