Ncert Exercises & Solutions

Nickel atom can lose two electrons to form Ni²⁺ ion. The atomic number of nickel is 28. From which orbital will nickel lose two electrons?

{}_{28}{Ni} = 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}, 3 d^{8}, 4 s^{2}

; Nickel will lose 2 electrons from 4s (outermost shell) to form Ni²⁺ ion.

Hence,

{}_{28}{Ni}_{2 +} = 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}, 3 d^{8}, 4 s^{0}