Question

In $ Cu\,\,(At.\,\,No.29) $

• A. 13 electrons have spin in one direction and 16 electrons in other direction
• B. 14 electrons have spin one direction and 15 electrons in other direction
• C. one electron can have spin only in the clockwise direction
• D. None of the above is correct

Answer 1

Answer: (B)

$ Cu $ (Atomic no. $ =29 $ ) $ =1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{6}},\,\,3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},\,\,4{{s}^{1}} $ $ \because $ In an orbital the two electrons must have the opposite spin. $ \therefore $ In $ Cu\, $ , $ 14 $ electrons have spin in one direction and $ 15 $ electrons in other direction.