NEET 2026, Chemistry Q41: Periodicity In Atomic Properties

NEET2026Chemistry

Identify the incorrect statement from the following:

A
The largest and the smallest species among Mg, Mg $^{2 +}$ , Al and Al $^{3 +}$ are Al and Mg $^{2 +}$ , respectively.
B
The IUPAC name of the element with atomic number 107 is Unnilseptium.
C
The similarity in behaviour of Li with Mg is referred to as ‘diagonal relationship’.
D
The oxidation state and covalency of Al in $[A l C l (H_{2} O)_{5}]^{2 +}$ are 3 and 6 respectively.

Solution

For Mg, Mg $^{2 +}$ , Al and Al $^{3 +}$ , the size order is Mg > Al > Mg $^{2 +}$ > Al $^{3 +}$ . So the largest is Mg and the smallest is Al $^{3 +}$ , not Al and Mg $^{2 +}$ as stated. Hence statement (1) is incorrect.

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NEET 2026, Chemistry Q41: Periodicity In Atomic Properties

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