railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Periodic Table

Cu નું સાચું ઇલેક્ટ્રોનિક રૂપરેખાંકન છે:

1
[Ar]3d 9 4s 2
2
[Kr]3d 9 4s 2
3
[Kr]3d 10 4s 1
4
[Ar]3d 10 4s 1
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