After np orbitals are filled, the next orbital filled will be :-

After filling of np orbital, the next orbital filled will be

Identify orbitals which are filled in 6th period

Identify orbitals which are filled in 6th period

After filling the 4d-orbitals, an electron will enter in:

In the sixth period, the orbitals being filled are

Which orbitals are filled with electrons in 3rd period?

Which orbitals are filled with electrons in 3rd period?

While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why?

While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why?