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Question #41320

1 Answer

Apr 19, 2015

Na

#1s^2#
#2s^2# #2p^6#
#3s^1#

Fe

#1s^2#
#2s^2# #2p^6#
#3s^2# #3p^6# #3d^6#
#4s^2#

Kr

#1s^2#
#2s^2# #2p^6#
#3s^2# #3p^6# #3d^10#
#4s^2# #4p^6#

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