₊₂₀Ca 1s²2s²2p⁶3s²3p⁶4s²
s ⇵
p ⇅⇅⇅
₊₂₀Ca
₊₃₈Sr 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²
d ⇅⇅⇅⇅⇅
₊₃₈Sr
₊₄₈Cd 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²
₊₄₈Cd
₊₅₆Ba 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶6s²
p ⇅⇅⇅ s ⇵ d ⇅⇅⇅⇅⇅ p ⇅⇅⇅ s ⇵
d ⇅⇅⇅⇅⇅ p ⇅⇅⇅ s ⇵
p ⇅⇅⇅ s ⇵
p ⇅⇅⇅ s ⇵ s ⇵ ₊₅₆Ba
₊₈₀Hg 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f¹⁴5s²5p⁶5d¹⁰6s²
f ⇅⇅⇅⇅⇅⇅⇅
₊₈₀Hg
₊₈₈ Ra 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f¹⁴5s²5p⁶5d¹⁰6s²p⁶7s²
₊₈₈ Ra
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Verified answer
₊₂₀Ca 1s²2s²2p⁶3s²3p⁶4s²
s ⇵
p ⇅⇅⇅
s ⇵
p ⇅⇅⇅
s ⇵
s ⇵
₊₂₀Ca
₊₃₈Sr 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²
s ⇵
p ⇅⇅⇅
s ⇵
d ⇅⇅⇅⇅⇅
p ⇅⇅⇅
s ⇵
p ⇅⇅⇅
s ⇵
p ⇅⇅⇅
s ⇵
s ⇵
₊₃₈Sr
₊₄₈Cd 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²
s ⇵
d ⇅⇅⇅⇅⇅
p ⇅⇅⇅
s ⇵
d ⇅⇅⇅⇅⇅
p ⇅⇅⇅
s ⇵
p ⇅⇅⇅
s ⇵
p ⇅⇅⇅
s ⇵
s ⇵
₊₄₈Cd
₊₅₆Ba 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶6s²
s ⇵
p ⇅⇅⇅ s ⇵ d ⇅⇅⇅⇅⇅ p ⇅⇅⇅ s ⇵
d ⇅⇅⇅⇅⇅ p ⇅⇅⇅ s ⇵
p ⇅⇅⇅ s ⇵
p ⇅⇅⇅ s ⇵ s ⇵ ₊₅₆Ba
₊₈₀Hg 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f¹⁴5s²5p⁶5d¹⁰6s²
s ⇵
f ⇅⇅⇅⇅⇅⇅⇅
d ⇅⇅⇅⇅⇅
p ⇅⇅⇅
s ⇵
d ⇅⇅⇅⇅⇅
p ⇅⇅⇅
s ⇵
p ⇅⇅⇅
s ⇵
s ⇵
₊₈₀Hg
₊₈₈ Ra 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f¹⁴5s²5p⁶5d¹⁰6s²p⁶7s²
s ⇵
p ⇅⇅⇅
s ⇵
d ⇅⇅⇅⇅⇅
p ⇅⇅⇅
s ⇵
f ⇅⇅⇅⇅⇅⇅⇅
d ⇅⇅⇅⇅⇅
p ⇅⇅⇅
s ⇵
d ⇅⇅⇅⇅⇅
p ⇅⇅⇅
s ⇵
p ⇅⇅⇅
s ⇵
s ⇵
₊₈₈ Ra