Why is the ground state electronic configuration of gadolinium and lawrencium different than expected?

Why the ground state electronic configuration of gadolinium and ytterbium are different than expected?

Ground state electronic configuration of Cr atom is :

Which of the following is the electronic configuration of nitrogen atom in ground state?

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s^2 2s^2 2p^3 , the simplest formula for this compound is

Which of the following electronic configuration is not possible in the ground state of an atom?

Answer the following questions: Deending on electronic configuration the properties of elements vary in different periods. Explain why?

Answer the following questions: State the electronic configuration of nitrogen and phosphorus.

Among the following outermost electronic configurations of transition metals, which shows the highest oxidation state?

Answer the following questions in one sentence each : From the symbol "_8^16O , state the electronic configuration of oxygen and the atomic mass number of isotope oxygen.

For the ground state, the electron in the H - atom has an angular momentum=L, according to the simple Bohr model. Angular momentum is a vector and hence there will be infinitely many orbits with the factor pointing in all possible directions, In actuality this is not true,