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NEET2015ChemistryStructure of AtomActual

The number of d -electrons in Fe 2 +   ( Z = 26 ) is not equal to the number of electrons in which one of the following?

Options

  1. As -electrons in Mg   Z = 12
  2. Bp -electrons in Cl   Z = 17
  3. Cd -electrons in Fe   Z = 26
  4. Dp -electrons in Ne   Z = 10

Correct answer

B. p -electrons in Cl   Z = 17

Step-by-step solution

26 Fe 2 + ⇒ 18 Ar   3 d 6   ;   6   d -electrons 17 Cl ⇒ 1 s 2   2 s 2   2 p 6   3 s 2   3 p 5   ;   11   p -electrons Mg = 1 s 2 2 s 2 2 p 6 3 s 2   ;   6   s -electrons d -electrons in Fe =   18 Ar 3 d 6 = 6 p -electrons in Ne = 1 s 2 2 s 2 2 p 6 = 6

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