Question

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

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

Answer 1

Answer: (A)

Electronic configuration of $ _{28}Ni=1{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}}3{{d}^{8}},4{{s}^{2}} $ $ N{{i}^{2+}}=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{8}},4{{s}^{0}} $ $ _{29}Cu=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{1}} $ $ C{{u}^{+}}=1{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},\text{ }4{{s}^{0}} $ So, the given configuration is of $ C{{u}^{+}} $