The ratio of the time periods of revolutions of the electron in the third orbit of hydrogen and second orbit of He+ is
32:1
2:27
16:1
27:2
The observation that the ground state of nitrogen atom has 3 unpaired electrons in its electronic configuration is associated with
Heisenberg's uncertainty principle
Pauli's exclusion principle
Aufbau principle
Hund's rule of maximum multiplicity
The orbital which does not have any directional characteristic is
dz2
px
s
dx2 - y2
What is the time taken for an electron to complete an revolution in the Bohr orbit of hydrogen atom ?
4π2mr2/nh
h/2πmr
nh.4π2mr
2πmr/n2h2
The magnetic quantum number for the last electron in sodium atom is equal to
2
3
0
1
The quantum number not obtained from Schrodinger wave equation is
l
m
n
The maximum number of electrons in a subshell having the same value of spin quantum number is given by
l (l + 1)
√l(l + 1)
l + 2
2l + 1
The energy of an electron in the 3rd Bohr orbit of hydrogen atom is -E. Then the energy of the electron in the first orbit will be
4 E
-E/6
-E/2
-9 E
What is the orbital angular momentum of an electron in 3s orbital ?
Zero
h/2π
√2 h/2π
None of these
Which one has the same unit that of Planck's constant ?
Energy
Work
Angular momentum
Linear momentum
