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

[edit] See also

Electron configuration

[edit] External links

Images of g-orbitals from the University of Kentucky

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