How many valence electrons are there?
How many valence electrons are there in an atom with the electron configuration [noble gas]ns2(n－1)d8 ?
(A) 2 (B) 6 (C) 8 (D) 10 (E) 18
The answer is (D)
WHY? Please explain.
- 9 年前最佳解答
Lets say its 4s2 3d8. An atom always tries to get stable by completing its orbital. Hence the 2 electrons in 4s is given to the 3d orbital to complete its quota of 10 electrons. Hence the hybrid configuration is 4s0 3d10.