Structure of Atom

The following quantum numbers are possible for how many orbital(s) n= 3, l = 2, m = +2 ?

Number of unpaired electrons in N²⁺ is

What is the maximum number of electrons that can be associated with the following set of quantum numbers? n=3, l=1 and m=–1

For azimuthal quantum number l= 3,the maximum number of electrons will be

The total number of atomic orbitals in fourth energy level of an atom is :

The energy of second Bhor orbit of the hydrogen atom is -328 kJ mol⁻¹, hence the energy of fourth Bohr orbit would be

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

Deuterium nucleus contains

According to Bohr’s theory, the angular momentum of electron in 5th orbit is

The ratio of the difference in energy between first and second Bohr orbit to that between the second and the third Bohr orbit is

The set of quantum number for 19th electron of chromium(Z=24) is

Maximum number of electrons in a subshell of an atom is determined by the following:

The order of filling of electrons in the orbitals of an atom will be

The correct set of four quantum numbers for the valence electron of rubidium atom(Z=37) is

If ionization potential for hydrogen atom is 13.6eV, then ionization potential for He⁺ will be

The momentum of a particle having a de Broglie wavelength of 10⁻¹⁷metres is (Given h= 6.625 × 10⁻³⁴Js)

The de-Broglie wavelength associated with a ball of mass 1kg having kinetic energy 0.5 J is

If the energy of a photon is given as 3.03 × 10⁻¹⁹J then, the wavelength (λ) of the photon is :

Which one of the following species does not exist under normal conditions?

Which of the following is a pair of isoelectronic species?

The ion that is isoelectronic with CO is

An ion has 18 electrons in the outermost shell, it is

The electron was shown experimentally to have wave properties by

The electron configuration of an element is 1s²,2s²,2p⁶,3s²,3p⁶,3d⁵,4s¹. This represents its

The orbital angular momentum of a p-electron is given as :

The spectrum of He is expected to be similar to

Bhor’s theory is applicable to

The orientation of an atomic orbital is governed by

Which of the following is not permissible arrangement of electrons in an atom?

For which one of the following sets of four quantum numbers, an electron will have the highest energy? n=3, l=2, m=1, s=1/2

Set of isoelectronic species is

If n = 6, the correct sequence for filling of electrons will be:

Which of the following has the minimum bond length ?

The number of spherical nodes in 3p orbitals are

In a given atom no two electrons can have the same values for all the four quantum numbers. This is called

If r is the radius of the first orbit, the radius of nth-orbit of H-atom is given by

Which of the following is never true for cathode rays?

The total number of electrons that can be accommodated in all the orbitals having principal quantum number 2 and azimuthal quantum number 1 is

The position of both, an electron and a helium atom is known within 1.0 nm. Further the momentum of the electron is known within 5.0 x 10⁻²⁶ kg ms⁻¹. The minimum uncertainty in the measurement of the momentum of the helium atom is

According to law of photochemical equivalence the energy absorbed (in ergs/mole) is given as(h= 6.62 x 10⁻²⁷ergs, c= 3 x 10¹° cm s⁻¹,N= 6.02 x 10²³ mol⁻¹)

Uncertainty in the position of an electron (mass=9.1 x 10⁻³¹ kg) moving with velocity 300 ms⁻¹, accurate upon 0.001% will be (h=6.63 x 10⁻³⁴ Js)

The energy absorbed by each molecule (A2) of a substance is 4.4 x 10⁻¹⁹ J and bond energy per molecule is 4.0 x 10⁻¹⁹J. The kinetic energy of the molecule per atom will be:

According to Bohr’s theory the energy required for an electron in the Li²⁺ ion to be emitted from n = 2 state is (given that the ground state ionization energy of hydrogen atom is 13.6 eV)

The ions O²⁻, F⁻, Na⁺, Mg²⁺ and Al³⁺ are isoelectronic. Their ionic radii show

Based on equation E = – 2.178 x 10⁻¹⁸J (Z²/n²), certain conclusions are written. Which of them is not correct?

According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

Which of the following statements do not form a part of Bohr’s model of hydrogen atom ?

The energies E1 and E2 of two radiations are 25eV and 50 eV, respectively. The relation between their wavelengths i.e., λ₁ and λ₂ will be: