EasyChemistry
+4 / -1
Which of the following order of atomic/ionic radius is incorrect?
A
I –> I > I+
B
Mg+2> Na+> F–
C
P +5< P+3
D
Li > Be > B
Explanation
O²⁻, F⁻, Na⁺, Mg²⁺, Al³⁺ are 10-electron ions. In an isoelectronic series, radius falls as nuclear charge rises, so size order is F⁻ > Na⁺ > Mg²⁺ (≫ Al³⁺). Option B reverses this trend by placing Mg²⁺ largest and F⁻ smallest, hence the sequence Mg²⁺ > Na⁺ > F⁻ is incorrect; other options follow accepted size relationships.
Previous
In the modern long-form of the periodic table, total number of the horizontal ro
NextAtomic number of element Ununnilium is;
More from Periodic Table
Hard
(A), (B) and (C) are elements in the second short period. Oxide of (A) is ionic, that of (B) is amph
HardThe basic character of MgO, SrO, K₂O and NiO increases in the order -
HardArrange into the order of increasing basicity (NO₂, K₂O, ZnO) -
HardArrange the following hydrides in their increasing acid strength [CH₄, H₂S, PH₃ and SiH₄] -
HardConsider the M(OH)₃ formed by all the group 13 elements. The correct sequence of acidic strength of
HardThe correct order regarding the electro-negativity of hybrid orbitals of carbon is ?
Practice Chemistry Exams
Full-length mock tests with detailed analytics, rank, and percentile.
Browse Exams