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

Cu இன் சரியான மின்னணு கட்டமைப்பு:

1

[Ar]3d⁹4s²

2

[Kr]3d⁹4s²

3

[Kr]3d¹⁰4s¹

4

[Ar]3d¹⁰4s¹

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