question_answer 110)

  Nickel atom can lose two electrons to form \[N{{i}^{2+}}\] ion. The atomic number of nickel is 28. From which orbital will nickel lose two electrons?

Answer:

  \[N{{i}_{28}}\to 1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{8}},4{{s}^{2}}\] \[N{{i}^{2+}}\to 1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{8}},4{{s}^{0}}\] Nickel will lose electrons from 4s orbitals.