Question

The atomic number of $ Ni $ and $ Cu $ are $ 28 $ and $ 29 $ respectively. The electronic configuration $ 1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{10}} $ represents

• A. $ Ni $
• B. $ N{{i}^{2+}} $
• C. $ C{{u}^{2+}} $
• D. $ C{{u}^{+}} $

Answer 1

Answer: (D)

Electronic configuration of $ Ni $ (At no. $ =28 $ ) and $ Cu $ (At. no. $ =29 $ ) is $ Ni=1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{6}},\,\,3{{s}^{2}}3{{p}^{6}}3{{d}^{8}},\,\,4{{s}^{2}} $ $ Cu=1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{6}},\,\,3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},\,\,4{{s}^{1}} $ Hence, $ 1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{6}},\,\,3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},\,\,4{{s}^{0}} $ electronic configuration shown by $ C{{u}^{+}} $ ion.