block
a set of elements in the periodic table of elements, defined by shape of an orbital—s, p, d, or f—where the valence electron lies
f-block
periodic table block; in the center-left of a 32-column periodic table but in the footnoted appendage of 18-column tables.
g-block
hypothetical block of elements in the extended periodic table whose outermost electrons are posited to have one or more g-orbital electrons but no f-, d- or p-orbital electrons
s-block
periodic table block
p-block
periodic table block; on the right side of the periodic table and includes elements from the six columns beginning with column 13 and ending with column 18
d-block
periodic table block; on the middle of the periodic table and includes elements from groups 3 through 12