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

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a
1s22s22p63s23p63d5
b
1s22s22p63s23p64s13d4
c
1s22s22p63s23p64s23d3
d
1s22s22p63s23p54s13d5

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detailed solution

Correct option is A

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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