Which of the following pairs of species have nearly same size?

Along the period (rarr) atomic // ionic radii and metallic character decreases while IE , EN , non-metallic character and oxidising power increases. Down the group (darr) , atomic // ionic radii, metallic character and reducing character increase while IE and EN decrease. However, Delta_(eg)H^(ɵ) becomes less negative down a group but more negative along a period. In which of the following pairs, both species have nearly the same size ? (more than one correct)

Along the period (rarr) atomic // ionic radii and metallic character decreases while IE , EN , non-metallic character and oxidising power increases. Down the group (darr) , atomic // ionic radii, metallic character and reducing character increase while IE and EN decrease. However, Delta_(eg)H^(ɵ) becomes less negative down a group but more negative along a period. In which of the following pairs, both species have nearly the same size ? (more than one correct)

Because of lanthnoid contractoin, which of the following pairs of elements have nearly same atomic radii ? (Number in the parentrhesis are atomic numbers)

Because of lanthanide contraction, which of the following pairs of elements have nearly same atomic radii (Number in the parenthesis are atomic numbers)-

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic, radii? (Numbers in the parenthesis areratomic numbers).