Any p-orbital can accommodate up to
Four electrons
Six electrons
Two electrons with parallel spins
Two electrons with opposite spins
Correct set of four quantum numbers for the valence (outermost) electron of rubidium (Z=37) is :
5,0,0 +½
5,1,0, +½
5,1,1, +½
6,0,0, +½
The wavelength of a spectral line for an electronic transition is inversely related to:
The number of electrons undergoing the transition
The nuclear charge of the atom
The difference in the energy of the energy levels involved in the transition
The velocity of the electron undergoing the transition
Which of the following relates to photons both as wave motion and as a stream of particles?
Inference
E=mc2
Diffraction
E=hv
A 3p orbital has:
Two non spherical nodes
Two spherical nodes
Two spherical & one non spherical node
One spherical and two non spherical nodes
The electrons, identified by quantum numbers n and I,(i) n=4, I,(ii) n=4, I =0, (iii) n=3, I =2, and (iv) n=3, I =I can be placed in order of increasing energy, from the lowest to highest, as
(iv)<(ii)<(iii)<(i)
(ii)<(iv)<(i)<(iii)
(i)<(iii)<(ii)<(iv)
(iii)<(i)<(iv)<(ii)
Rutherford’s experiment, which established the nuclear model of the atom, used a beam of
(-particle, which impinged on a metal foil and got absorbed
(-rays, which impinged on a metal foil and ejected electrons
Helium atoms, which impinged on a metal foil and got scattered
Helium nuclei, which impinged on a metal foil and got scattered
If the nitrogen atom has electronic configuration 1s7
It would have energy lower than of the normal ground state configuration 1s22s22p3, because the electrons would be closer to the nucleus. Yet 1s7 is not observed because it violates.
Heisenberg uncertainty principle
Hund’s rule
pauli exclusion principle
Bohr postulate of stationary orbits
The radius of which of the following orbit is same as that of the first Bohr’s orbit of hydrogen atom?
He+ (n=2)
Li2+ (n=3)
Li2+ (n=1)
Be3+ (n=4)
The energy of an electron in the first Bohr orbit of H atom is -13.6 eV. The possible energy value(s) of the excited state(s) for electrons in Bohr orbits of hydrogen is (are)
-3.4 eV
-4.2 eV
-6.8 eV
+6.8 eV