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CGP EDU Academic Team
Published on: August 11, 2026
Why NO 2 + and I 3 – are linear species ?
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In NO 2 + the N has sp hybridisation; so it is linear O = 
= 
In I 3 – there are 5 electron pairs around central iodine atom (3 lone pairs and 2 bond pairs). The hybridisation of iodine is thus sp 3 d. To have minimum repulsions between lp-lp and lp-bp it acquires linear shape as shown below.
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