Question

If alfbau rule is not followed so k-19 will be placed in
a) s block
b) p block
c) d block
d) f block

Answer 1

The aufbau principle states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. ... The aufbau principle is sometimes called the building-up principle or the aufbau rule