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Periodic table (block)
Helium is placed next to hydrogen instead of on top of neon because it is part of the s2 group. In addition to the blocks listed in this table, there is a hypothetical g-block which is not pictured here. g-block elements can be seen in the expanded extended periodic table.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Periodic_table_(block)". A list of authors is available in Wikipedia.|