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JEE Main2016ChemistryStructure of AtomActual

Aqueous solution of which of the following salts will not contain ions with the electronic configuration 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 ?

Options

  1. ANaF
  2. BKBr
  3. CNaCl
  4. DC a I 2

Correct answer

A. NaF

Step-by-step solution

NaF   → Na + → 1 s 2   2 s 2   2 p 6 F - → 1 s 2   2 s 2   2 p 6 Not Match KBr   → K + = 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 Br - = 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 4 p 6 NaCl   → Na + = 1 s 2 2 s 2 2 p 6 Cl = 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 CaI 2 → Ca + 2 = 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 I - = Kr 4 d 10 5 s 2 5 p 6

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