The phenomenon resulting from the weakly effective screening of outermost electrons from the nucleus by f subshell electrons,resulting in only small differences in atomic radii in elements of atomic number 58-71,is called the:
A)actinide expansion
B)f-subshell extension
C)lanthanide contraction
D)elemental transition
E)lattice distortion

Question

Quizplus · Accepted Answer

The phenomenon described is known as the lanthanide contraction, which refers to the small differences in atomic radii in elements of atomic number 58-71 due to weakly effective screening of outermost electrons from the nucleus by f subshell electrons. This contraction results in the atoms of these elements having similar atomic radii. Therefore, option C is the correct choice. The other options (A, B, D, and E) are not relevant to the phenomenon described.

The Phenomenon Resulting from the Weakly Effective Screening of Outermost