write down the electronic configuration of Na+,Fe3+,F-,K+,S2-
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Na+ = 1s²,2s²,2p6
Fe3+ = 1s²,2s²,2p6,3s²,3p6,3d5
F- = 1s²,2s²,2p6
K+ = 1s²,2s²,2p6,3s²,3p6
S2- = 1s²,2s²,2p6,3s²,3p6
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