If the electronic structure of oxygen atom is written as it would violate
1. Hund's rule
2. Paulis exclusion principle
3. Both Hund's and Pauli's principles
4. None of these
If n=6, the correct sequence for filling of electrons will be
Magnetic moment 2.84 BM is given by (At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)
The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Tb Atomic no. 65) are
(a) [Xe]4f65d16s2, [Xe]4f75d16s2 and [Xe]4f96s2
(b) [Xe]4f65d16s2, [Xe]4f75d16s2 and [Xe]4f85d16s2
(c) [Xe]4f76s2, [Xe]4f75d16s2 and [Xe]4f96s2
(d) [Xe]4f76s2, [Xe]4f86s2 and [Xe]4f85d16s2
The element Z =114 has been discovered recently. It will belong to which of the following family/group and electronic configuration?
(a) Halogen family, [Rn]5f146d107s27p5
(b) Carbon family, [Rn]5f146d107s27p2
(c) Oxygen family, [Rn]5f146d107s27p4
(d) Nitrogen family, [Rn]5f146d107s27p6
Which one is the wrong statement?
(a) de-Broglie's wavelength is given by =h/mv
where m= mass of the particle,
v= group velocity of the particle
(b) The uncertainty principle is
(c) Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement
(d) The energy of 2s-orbital is less than the energy of 2p-orbital in case of hydrogen like atoms.
How many unpaired electrons are present in Ni2+ cation (atomic number = 28)
Which of the following pair is isodiaphers?
Which of the following species has more number of electrons in comparison with the neutrons?
Maximum number of electrons in a subshell with l = 3 and n = 4 is
The angular momentum of an electron in d orbital is equal to
4. 0 h
Which of the following pairs of d-orbitals will have electron density along the axes?
A photon of wavelength 300 nm causes the emission of two photons. If the wavelength of one of them is 700 nm. What is the wavelength of the other photon?
1. 525 nm
2. 600 nm
3. 450 nm
4. 300 nm