Question

Select the statement that explains why the trend in atomic radii for main-group elements is not observed in transition elements.

As protons are added to the nuclei of the transition elements when moving from left to right across a period, electrons are added to the (?−1)?(n−1)d subshell. The number of electrons in the outermost shell (?n) remain constant. This results in a roughly constant effective nuclear charge.

As protons are added to the nuclei of the transition elements when moving from left to right across a period, electrons are added to the outermost energy level (?n). This results in a decrease in the effective nuclear charge experienced by the outermost electrons, resulting in a weaker force of attraction between the nucleus and electrons.

As protons are added to the nuclei of the transition elements when moving from left to right across a period, electrons are added to the (?−1)?(n−1)d subshell. The number of electrons in the outermost shell (?n) remain constant. This results in a decrease in the effective nuclear charge.

As protons are added to the nuclei of the transition elements when moving from left to right across a period, electrons are added to the (?−1)?(n−1)d subshell. The number of electrons in the outermost shell (?n) remain constant. This results in an increase in the effective nuclear charge.

As protons are added to the nuclei of the transition elements when moving from left to right across a period, electrons are added to the outermost energy level (?n). This results in an increase in the effective nuclear charge experienced by the outermost electrons, resulting in a stronger force of attraction between the nucleus and electrons.

Answer 1