(d) -9E . (a) H E ∧ ψ ψ . (d) ΔE.ΔX ≥h/ π 11th Std Chemistry 11th Std Chemistry - - - - Key to multiple choice questions: . M + : 1s 2s 2p 3s 3p 3d M : 1s 2s 2p 3s 3p 3d Atomic number = Mass number = No.
of neutrons = - = . E = hν = hc/λ × × J s m s m J . E E eV eV hc hc λ λ λ λ . Spliting of spectral lines in magnetic field is called Zeeman effect and spliting of spectral lines in electric field, is called Stark effect.
. Correct statement: For n= , the electron has more negative energy than it does for n= which means that the electron is strongly bound in the smallest allowed orbit. . n = to n= E = - .
eV atom - E - E = (- . / ) - (- . / ) = . eV atom - .
Spin quantum number For the first electron m s = +½ For the second electron m s = -½ . Eu : [Xe] 4f , 5d , 6s Gd : [Xe] 4f , 5d , 6s Tb: [Xe] 4f , 5d , 6s ( l + ) = l + . Orbital angular momentum = √( l ( l + ) h/ π For d orbital = √( x ) h/ π = √ h/ π n = ; l = ; m = - either 3p x or 3p y i.e., Maximum two electrons can be accomodated either in 3p x or in 3p y