" Out of first "100" elements,number of elements having electrons in "3d" -orbitals are "

Out of the first 100 elements the number of elements having electrons in the 3d orbital are

The element having electron affinity is

In which of the following elements one electron is present in 5d orbitals ?

Find the outermost electrons in f orbital in element Np

The atomic number of an element is 17. The number of orbitals containing electron pairs in its valence shell is

What is the maximum number of element that can be presents in a. 2d orbitals b. All the orbitals with n = 3

In s- block elements, the differentiating electron enters the ________orbital.