Quantum number is address of an electron in amy atom . They are of four types : (A) Principal quantum number (n) (b) Azimuthal quantum number (l) (c ) Magnetic quantum number (m) (d) spin quantum number (s) prinicial quantum tells us the number of shells . Azimuthal quantum number tells is the name o f sub - shell ./ FOr s,p,f:l = 0,1,2,3 respectively .Magnetic quantum number represents the orientation of sub shell and spn wuantum number repesents the quantum spin states . Elemetn A has principal quantum number 2 for last electron and it has 3 electrons in valence shell and element B has prinvipal quantum number 3 for last electron and it has 7 electrons in avalence shell . the single central atom ) will be :

Quantum number is address of an electron in amy atom . They are of four types : (A) Principal quantum number (n) (b) Azimuthal quantum number (l) (c ) Magnetic quantum number (m) (d) spin quantum number (s) prinicial quantum tells us the number of shells . Azimuthal quantum number tells is the name o f sub - shell ./ FOr s,p,f:l = 0,1,2,3 respectively .Magnetic quantum number represents the orientation of sub shell and spn wuantum number repesents the quantum spin states . which opition is not correct accoding to quantam number ?