The P-block reference article from the English Wikipedia on 24-Jul-2004
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P-block

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Elemental Groups

Subgroups

P-block (for principal, although this orbital has nothing to do with principal quantum number) elements are made up of elements in group 13-18 in the periodic table which all occupy the highest energy orbital, the p orbital. The outer electron shell configurations of all these elements all have the from ns2npx (x=1 to 6)

See also