Question

The electronic configuration of copper can be represented in this/these way/ways

1) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰

 2) [Ar] 3d¹⁰ 4s¹ 

3) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹ 

1) Only 1 & 2 are correct 

2) Only 2 is correct 

3) Only 2 and 3 are correct 

4) Only 1 and 3 are correct

Answer 1

1) Only 1 & 2 are correct