2026 Classification of Elements and Periodicity in PropertiesAtomic/ionic radii trends and IUPAC nomenclature of elements Hard Question 1 of 41 in Classification of Elements and Periodicity in Properties

Identify the INCORRECT statement from the following:

A The IUPAC name of the element with atomic number 107 is Unnilseptium.
B The largest and the smallest species among Mg, $Mg^{2+}$, Al and $Al^{3+}$ are Al and $Mg^{2+}$, respectively.
C The similarity in behaviour of Li with Mg is referred to as 'diagonal relationship'.
D The oxidation state and covalency of Al in $[AlCl(H_2O)_5]^{2+}$ are 3 and 6, respectively.

The answer is B.

Solution

Size order: $Mg > Al > Mg^{2+} > Al^{3+}$ Largest $\rightarrow$ Mg ; Smallest $\rightarrow$ $Al^{3+}$ So the statement that the largest and smallest species are Al and $Mg^{2+}$ is incorrect.

Classification of Elements and Periodicity in Properties in past papers

41 questions from this chapter have appeared across 23 exam years.