g-block

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The g-block is a hypothetical region in the periodic table of the elements. No elements in this region have yet been discovered in nature or synthesized artificially. (Element 122 was claimed to exist naturally in April 2008, but this claim was widely believed to be erroneous.[1]) The first element of the g-block would have atomic number 121, and the systematic name unbiunium. Elements in this region are likely to be highly unstable with respect to radioactive decay, and have extremely short half lives, although element 126 is hypothesized to be within the island of stability.

According to the orbital approximation in quantum mechanical descriptions of atomic structure, the g-block would correspond to elements with partially-filled g-orbitals. However, spin-orbit coupling effects reduce the validity of the orbital approximation substantially for elements of high atomic number.

g-block
Period
g1 g2 g3 g4 g5 g6 g7 g8 g9 g10 g11 g12 g13 g14 g15 g16 g17 g18
8 121
Ubu		 122
Ubb		 123
Ubt		 124
Ubq		 125
Ubp		 126
Ubh		 127
Ubs		 128
Ubo		 129
Ube		 130
Utn		 131
Utu		 132
Utb		 133
Utt		 134
Utq		 135
Utp		 136
Uth		 137
Uts		 138
Uto
9 171
Usu		 172
Usb		 173
Ust		 174
Usq		 175
Usp		 176
Ush		 177
Uss		 178
Uso		 179
Use		 180
Uon		 181
Uou		 182
Uob		 183
Uot		 184
Uoq		 185
Uop		 186
Uoh		 187
Uos		 188
Uoo

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