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

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

Out of the first 80 elements,the number of elements having 3d orbitals are:

The elements in which electron enters to 3d orbitals

In which of the following elements number of d - electrons is zero in 6d - orbital -

In which element does the last or differentiating electron enter into the 3 d orbital ? Write its atomic number and electronic configuration.

Name an element, the atom of which contains maximum number of unpaired electrons in the d orbital.

Elements in the first period have valence electrons in

Element A has 3 electron in the outermost orbit and element B has 7 electrons in the outermost orbit. The formula of the compound formed between A and B would be