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[Kr]5s24d1 would be Yttrium, If I remember correctly.
Christop Hodkiewicz ∙
The electron configuration of the element Strontium, or Sr.. 5s2 being the 5th spherical orbital, with 2 electrons..as for the [kr], Idk
Since it has a -1 charge, it must have 1 more electrons than in the ground state, making the ground state[Kr]5s2 4d10 5p4. This looks like Te (tellurium).