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Which of the following does not exist as an octatomic solid?

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in Chemistry – Class 12 by (188k points)
Which of the following does not exist as an octatomic solid?

(a) Sulphur

(b) Tellurium

(c) Selenium

(d) Oxygen

I got this question during an internship interview.

My doubt stems from P-Block topic in portion P-Block Elements of Chemistry – Class 12

1 Answer

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Best answer
Correct option is (d) Oxygen

The explanation is: Oxygen exists as a diatomic gas at room temperature while other elements (S, Se and Te) exist as octatomic solids. Due to small size and high electronegativity, oxygen atom forms pπ – pπ double bond with other oxygen atom to form O = O molecule. The intermolecular forces of attraction between oxygen molecules are weak van der Waals forces and hence oxygen exists as a diatomic gas at room temperature.

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