Given, the mass of electron is 9.11×10-31 kg Planck's constant is 6.626×10-34 Js,
the uncertainty involved in the measurement of velocity within a distance of 0.1Å is
5.79×106 ms-1
5.79×107 ms-1
5.79×108 ms-1
5.79×105 ms-1
The energy absorbed by each molecule (A2 ) of a substance is 4.4× 10-19 J and bond energy per molecule is 4.0× 10-19 J. The kinetic energy of the molecule per atom will be
2.0× 10-20 J
2.2× 10-19 J
2.0× 10-19 J
4.0× 10-20 J
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 electronic configuration of gadolinium (At no 64) is
[Xe]4f8 ,5d9 ,6s2
[Xe] 4f7 ,5d1 ,6s2
[Xe] 4f6 ,5d2 ,6s2
[Xe] 4d3 ,5d5 ,6s2
The following quantum numbers are possible for how many orbital(s) n = 3, l = 2, m = +2 ?
1
2
3
4
For azimuthal quantum number l = 3, the maximum number of electrons will be
6
0
14
In a given atom no two electrons can have the same values of all the four quantum numbers. This is called
Hund's rule
Aufbau principle
Uncertainty principle
Pauli's exclusion principle
The order of filling of electrons in the orbitals of an atom will be
3d,4s,4p,4d,5s
4s,3d,4p,5s,4d
5s,4p,3d,4d,5s
3d,4p,4s,4d,5s
An ion has 18 electrons in the outermost shell, it is
Cu+
Th4+
Cs+
K+
