Problem: Which of the following ions are isoelectronic with Kr? Check all that apply. a) K+ b) Sr2+ c) Br- d) Se2+

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Isoelectronic means the ion has the same electronic configuration as Krypton (Kr) which is:

1s22s22p63s23p64s23d104p6

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Problem Details

Which of the following ions are isoelectronic with Kr? Check all that apply. 

a) K

b) Sr2+ 

c) Br- 

d) Se2+