The following quantum numbers are possible for how many orbital(s) n = 3, l = 2, m = +2 ?
1
2
3
4
The number of spherical nodes in 3p orbital is/are
one
three
two
None of these
If uncertainty in position and momentum are equal, then uncertainty in velocity is
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
If r is the radius of the first orbit, the radius of nth orbit of H-atom is given by
rn2
rn
r2 n2
Electronic configuration of calcium atom can be written as
[Ne] 4p2
[Ar] 4s2
[Ne] 4s2
[Kr] 4p2
Which of the following is not permissible arrangement of electrons in an atom ?
n = 4, l = 0, m = 0, s = -1/2
n = 5, l = 3, m = 0, s = + 1/2
n = 3, l = 2, m = -3, s = -1/2
n = 3, l = 2, m = -2, s = -1/2
If ionisation potential for hydrogen atom is 13.6eV, then ionisation potential for He+ will be
54.4 eV
6.8 eV
13.6 eV
24.5 eV
The radius of hydrogen atom in the ground state is 0.53 Å. The radius of Li2+ ion (atomic number = 3) in a similar state is
0.17 Å
0.53 Å
0.265 Å
1.06 Å
The spectrum of He is expected to be similar to that of
H
Na
Li+
He+
