Structure of Atom

For a d-electron the orbital angular momentum is

The orbital angular momentum of an electron in 2s orbital is

Calculate the wave number for the shortest wavelength transition in the Balmer series of atomic hydrogen.

Consider the hydrogen atom to be a proton embedded in a cavity of radius a0 (Bohr radius) whose charge is neutralised by the addition of an electron to the cavity in vacuum, infinitely slowly. Estimate the average total energy of an electro...

A 3p orbital has

Iodine molecule dissociates into atoms after absorbing light of 4500 Å. If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms. (Bond energy of I2 = 240 kJ mol-1)

The outermost electronic configuration of Cr is _______.

Find out the number of waves made by a Bohr electron in once complete revolution in its 3rd orbit?

The light radiations with discrete quantities of energy are called ______.

The 2px, 2py and 2pz orbitals of atom have identical shapes but differ in their _____.

Estimate the difference in energy between 1st and 2nd Bohr orbit for a hydrogen atom. At what minimum atomic number, a transition from n = 2 to n = 1 energy level would result in the emission of X-rays with $$\lambda = 3.0 \times {10^{ - 8...

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 of He+ spectrum?

Wave functions of electrons in atoms and molecules are called ______.

In a given electric field, \(\beta-particles\) are deflected more than \(\alpha-particles\) in spite of \(\alpha-particles\) having larger charge.

Which of the following relates to photons both as wave motion and as a stream of particles?

Which of the following does not characterise X-rays?

According to Bohr's theory, the electronic energy of hydrogen atom in the nth Bohr's orbit is given by \({E_n} = {{ - 21.6 \times {{10}^{ - 19}}} \over {{n^2}}}J\). Calculate the longest wavelength of light (in Å) that will be needed to rem...

The correct ground state electronic configuration of chromium atom is

The correct set of quantum numbers for the unpaired electron of chlorine atom is

The uncertainty principle and the concept of wave nature of matter were proposed by ______ and ______ respectively. (Heisenberg Schrodinger, Maxwell, de Broglie)

The wavelength of a spectral line for an electronic transition is inversely related to :

The triad of nuclei that is isotonic is

The outermost electronic configuration of the most electronegative element is

The electron density in the XY plane in 3dx2 - y2 orbital is zero

The sum of the number of neutrons and proton in the isotope of hydrogen is

The ratio of the energy of a photon of 2000Å wavelength to that 4000Å radiation is

Rutherford's alpha particle scattering experiment eventually led to the conclusion that:

Which one of the following sets of quantum numbers represents an impossible arrangement?

The radius of an atomic nucleus is of the order of

What is the maximum number of electrons that may be present in all atomic orbitals with principal quantum number 3 and azimuthal quantum number 2?

Give reasons why the ground state outermost electronic configuration of silicon is:

Electromangnetic radiation with maximum wavelength is:

Bohr Model can explain

Correct set of four quantum numbers for the valence (outermost) electron of rubidium (Z = 37) is

An isotone of \({}_{32}^{76}Ge\) is

The electron energy in hydrogen atom is given by E = (-21.7 \(\times\) 10-12)/n2 ergs. Calculate the energy required to remove an electron completely from the n = 2 orbit. What is the longest wavelength (in cm) of light that can be used to ...

Many elements have non-integral atomic masses because:

When alpha particles are sent through a thin metal foil, most of them go straight through the foil because

Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon?

The increasing order (lowest first) for the values of e/m (charges/mass) for electron (e), proton (p), neutron (n) and alpha particle (\(\alpha\)) is:

Gamma rays are electromagnetic radiations of wavelengths of 10-6 to 10-5 cm

Rutherford's scattering experiment is related to the size of the

Elements of the same mass number but of different atomic numbers are known as ____.

Any p-orbital can accommodate upto

The principal quantum number of an atom is related to the

The energy of the electron in the 3d-orbital is less than that in the 4s-orbital in the hydrogen atom.

The outer electronic configuration of the ground state chromium atom is 3d4 4s2

Calculate the wavelength in Angstrom of the photon that is emitted when an electron in the Bohr orbit, n = 2 returns to the orbit, n = 1 in the hydrogen atom. The ionization potential of the ground state hydrogen atom is 2.17 \(\times\) 10-...

The ion that is isoelectronic with CO is

Isotopes of an element differ in the number of ______ in their nuclei.