The number of electrons present in f orbital of `Ho^(3+)` ion

Number of electrons present in 4f orbital of Ho^(3+) ion is __________ . (Given Atomic No. of Ho = 67)

The maximum number of electrons present in an orbit. l = 3 , is .

The total number of electrons present in all s orbitals, all the p orbitals, and all the d orbitals of cesium ion are, respectively,

The atomic number of an element is 35. What is the total number of electrons present in all the p -orbitals of the ground state atom of that element?