Question

S2-
Cu+
Sn2+
O2-
A 1s22s22p63s23p63d10
B. 2s2
C. 1s22s22p63s23p4
D. 1s22s22p63s23p63d104s1
E. 1s2
F. 1s22s22p63s23p64s23d104p65s24d10
G. 1s22s22p63s23p64s23d104p64d105s25p2
H. 1s22s22p4
I. 1s22s22p6
J. none of the above

Choose from the list the correct electron configurations for the following ions.
I thought the answers were J D F I but its showing online as incorrect

Answer 1

A. 1s2 2s2 2p6 3s2 3p6 3d10 <b>28e</b>
B. 2s2 <b>?e</b>
C. 1s2 2s2 2p6 3s2 3p4 <b>16e</b>

D. 1s2 2s2 2p6 3s2 3p6 3d10 4s1 <b>29e</b>

E. 1s2 <b>2e</b>

F. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 <b>48e</b>

G. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d10 5s2 5p2 <b>50e</b>

H. 1s2 2s2 2p4 <b>8e</b>

I. 1s2 2s2 2p6 <b>10</b>

S^2- must have 16+2=18e. None listed so J.
Cu^+ must have 29-1 = 28e. So A.
Sn^2+ must have 50-2 = 48. So ?
O^2- must have 8+2 = 10. So ?

Answer 2

1s22s22p63s23p4