State where in the periodic table these elements appear:
a. elements with the valence-shell electron configuration ns2np5
b. elements that have three unpaired p electrons
c. an element whose valence electrons are 4s24p1. Express your answer as the group and period number separated by a comma.
d. the d-block elements: groups 3-8, groups 3-12, groups 1-2, Lanthanides, or Actinides
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