Define principal quantum number (n)

cbse
structureofatom

#1

Define principal quantum number (n).
(ii) Write the electronic configuration of Cr+
[Atomic number of Cr = 24]
(iii) Define Pauli’s Exclusion principle.


#2

Principal quantum number tells the principal energy level or shell to which the electron belongs. It gives the information about the distance and the energy of the electron.
(ii) Cr+ = 1${{s}^{2}}$2${{s}^{2}}$2${{p}^{6}}$3${{s}^{2}}$3${{p}^{6}}$3${{d}^{5}}$
(iii) Pauli’s Exclusion principle states that no two
electrons in an atom can have the same set of four quantum numbers