The orbitals are called degenerate when
they have the same wave functions
they have the same wave functions but different energies
they have different wave functions but same energy
they have the same energy
When an electron of charge e and mass m moves with a velocity v about the nuclear charge Ze in circular orbit of radius r, the potential energy of the electrons is given by
The position of both, an electron and a helium atom is known within 1.0 mm. Further the momentum of the electron is known within 5.0×10-26 kg ms-1 . The minimum uncertainty in the measurement of the momentum of the helium atom is
50 kg ms-1
80 kg ms-1
80×10-26 kg ms-1
5.0×10-26 kg ms-1
Electronic configuration of calcium atom can be written as
[Ne] 4p2
[Ar] 4s2
[Ne] 4s2
[Kr] 4p2
The spectrum of He is expected to be similar to that of
H
Na
Li+
He+
For which one of the following sets of four quantum numbers, an electron will have the highest energy ?
n l m s
3 2 1
4 2 -1
4 1 0 -
5 0 0 -
The electronic configuration of Cu (atomic number 29) is
1s2,2s2,2p6,3s2,3p6,4s2,3d9
1s2,2s2,2p6,3s2,3p6,3d10,4s1
1s2,2s2,2p6,3s2,3p6,4s2,4p6,5s2,5p1
1s2,2s2,2p6,3s2,3p6,4s2,4p6,3d3
The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionisation energy of H = 2.18×10-18 J atom-1 and h = 6.625×10-34 Js)
1.54×1015 s-1
1.03×1015 s-1
3.08×1015 s-1
2.00×1015 s-1
Consider the following sets of quantum numbers
(i) 3 0 0 +1/2
(ii) 2 2 1 +1/2
(iii) 4 3 -2 -1/2
(iv) 1 0 -1 -1/2
(v) 3 2 3 +1/2
Which of the following sets of quantum number is not possible ?
(ii), (iii) and (iv)
(i), (ii), (iii) and (iv)
(ii), (iv) and (v)
(i) and (iii)
The orientation of an atomic orbital is governed by
azimuthal quantum number
spin quantum number
magnetic quantum number
principal quantum number
