A gas phase atom with the electronic configuration 1s22s22p63s23p64s23d6 loses three electrons. What is the electron configuration of the resulting gas phase ion?

  1. A

    1s22s22p63s23p63d5

  2. B

    1s22s22p63s23p64s13d4

  3. C

    1s22s22p63s23p64s23d3

  4. D

    1s22s22p63s23p54s13d5

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    Solution:

    Atomic number is iron is 26. Its electronic configuration is 

    1s22s22p63s23p64s23d6

    So, after loosing three electrons , the electronics configuration becomes 1s22s22p63s23p63d5

    Hence the option A is correct.

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