Which one of the following sets of quantum numbers is not possible for an electron in the ground state of an atom with atomic number 19 ?

Which one of the following sets of quantum numbers is not possible for

1.	Which one of the following sets of quantum numbers is not possible for an electron in the ground state of an atom with atomic number 19 ?
Answer» Quantum number were proposed out of NECESSITY in Bohr model of the atom. Knowing n and l it is possible to DESIGNATE a subshell. The PRINCIPAL quantum number alone can GIVE the complete energy of an electron in any atom. Azimutal quantum number refers to the subshell to which an electron belongs and describes the motion of the electron. Solution :Quantum numbers are taken to designate . In multi `e^-` system , `l , m_l` also required E describes SHAPE.