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Q35 (NDA-I/2008) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Periodic table elements Answer Verified

In which one of the following is the valence electronic configuration, ns2 np3 found?

Result
Your answer: —  ·  Correct: C
Explanation

The valence electronic configuration ns² np³ corresponds to elements in Group 15 of the periodic table, also known as the Nitrogen family [t1][t4]. These elements possess five valence electrons in their outermost shell [t8]. Nitrogen (atomic number 7) has the specific electronic configuration 1s² 2s² 2p³, where 2s² 2p³ represents its valence shell [t4][t7]. In contrast, Carbon (Group 14) has a valence configuration of ns² np² (total 4 valence electrons) [c2], Oxygen (Group 16) has ns² np⁴ (total 6 valence electrons) [t8], and Argon is a noble gas (Group 18) with a completely filled valence shell of ns² np⁶ (total 8 valence electrons) [c4]. Therefore, among the given options, only Nitrogen matches the ns² np³ configuration [t1][t7].

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.1 BONDING IN CARBON – THE COVALENT BOND > p. 59
  2. [2] Science , class X (NCERT 2025 ed.) > Chapter 3: Metals and Non-metals > 3.3 HOW DO METALS AND NON-METALS REA ALS REACT? > p. 47
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