JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
Aluminium is usually found in \(+3\) oxidation state. In contrast, thallium exists in \(+1\) and \(+3\) oxidation states. This is due to
- A inert pair effect
- B diagonal relationship
- C lattice effect
- D lanthanoid contraction
Answer & Solution
Correct Answer
(A) inert pair effect
Step-by-step Solution
Detailed explanation
The outermost electron configuration of \(Tl\) is \(6s^26p^1\). The \(6s\) electrons are strongly attracted towards the nucleus due to its more penetrating power and deshielding of \(d\) and \(f-\) electrons. Hence \(6s\) electrons do not participate in bonding
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