Can someone please help me, what am I doing wrong??? 1A 8A H 2A 3A 4A 5A 6A 7A H

Question

Can someone please help me, what am I doing wrong???

1A 8A H 2A 3A 4A 5A 6A 7A He Li Be K Ca Sc TiVCr MnFe CoNi Cu 2n Ga Ge As Se Br Kr Rb Sr r Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Tee Cs Ba La H Ta W Re Os Ir Pt Au Hg TI Pb Bi Po At Rn Fr Ra Ac Rf Ha Ce PrNd Pm Sm Eu GdTb Dy Ho Er Tm b Lu Th Pa U Np Pu Am Cm Bk C Es Fm Md No Lr Write the complete electron configuration for the iron(II) ioin 6 266 1s 2s 2p 3s 3p 3d Using NOBLE GAS notation write the electron configuration for the cobalt(III) ion A3d An error has been detected in your answer. Check for typos miscalculations etc. bef ore submitting your answer

Explanation / Answer

Fe atomic number is 26.

Electronic configuration can be written as 1s2 2s2 2p6 3s2 3p6 3d6 4s2

After removing 2 electrons Fe(II) : 1s2 2s2 2p6 3s2 3p6 3d6 4s0

Need to write most stable configuration : 1s2 2s2 2p6 3s2 3p6 3d5 4s1

Half filled orbitals or completed filled are always more stable.

Cobalt Atomic number is 27

Co(III) lost 3 electrons from Cobalt.

Electronic configuration can written as [Ar] 3d6 4s0

Stable configuration can also written is  [Ar] 3d5 4s1

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