RRB Group D practice question
There are four elements P, Q, R and S and their atomic numbers are 2, 6, 13 and 18, respectively. Which of the following pairs has elements having similar valency?
From a RRB Group D Science practice set · Science
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Correct answer: (C) P and S
P (Z=2) is Helium and S (Z=18) is Argon -- both are noble gases with zero/similar (complete octet) valency, so P and S have similar valency.
हिंदी में प्रश्न
ओजोन के एक अणु में ____________ होता है/होते हैं।
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सही उत्तर: (C) 3 ऑक्सीजन परमाणु
P (परमाणु क्रमांक 2) हीलियम है तथा S (परमाणु क्रमांक 18) आर्गन है -- दोनों अक्रिय गैसें हैं जिनकी संयोजकता शून्य (पूर्ण अष्टक) होती है, अतः P और S की संयोजकता समान है।
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