There are sub shells in shells around the nucleus.
(a) What is the maximum number of electrons that can be accommodated in d-sub shell ?
(b) Write the possible sub shells in 3rd shell in the increasing order of energy.
(c) Which of the following is the outermost electronic configuration of copper ?
(Atomic number = 29)
A : 3d9 4s2
B : 3d10 4s1
Justify your answer.