Home › NEET UG › chemistry › c11atomicradiitrends › Per NCERT Problem 3.5, among the species Mg, Mg²…
Per NCERT Problem 3.5, among the species Mg, Mg²⁺, Al, Al³⁺, which is the LARGEST and which is the SMALLEST?
ALargest = Mg²⁺; smallest = Al
BLargest = Al³⁺; smallest = Mg
CLargest = Al; smallest = Mg²⁺
DLargest = Mg; smallest = Al³⁺
Answer & Solution
Correct answer: D. Largest = Mg; smallest = Al³⁺
Per NCERT Problem 3.5, Mg > Al across period (Mg larger). Cations < parent atoms. Among Mg²⁺ and Al³⁺ (isoelectronic), Al³⁺ is smaller (higher Z). So largest = Mg, smallest = Al³⁺.
Related questions
Per NCERT §3.7.1(b) (last paragraph), comparing F (64 pm) and F⁻ (136 pm), the F⁻ ion is mPer NCERT §3.7.1(a) (final note), why are the radii of NOBLE GASES NOT compared directly wPer NCERT Table 3.6(b), the atomic radius of HALOGENS DOWN Group 17 follows what trend?Per NCERT §3.7.1(b), among the ISOELECTRONIC species O²⁻, F⁻, Na⁺, Mg²⁺ (each with 10 e⁻),Per NCERT §3.7.1(b), what does ISOELECTRONIC mean, and which example does the textbook givPer NCERT §3.7.1(b), why is an ANION LARGER than its parent neutral atom?Per NCERT §3.7.1(b), why is a CATION smaller than its parent neutral atom?Per NCERT Table 3.6(a), how does the atomic radius of Period-II elements change from Li (1