Structure of Atom

A certain orbital has no angular nodes and two radial nodes. The orbital is :

Outermost electronic configuration of a group 13 element, E, is 4s², 4p¹. The electronic configuration of an element of p-block period-five placed diagonally to element, E is :

Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x), (y) an (z) is :

The orbital having two radial as well as two angular nodes is :

The correct statement about probability density (except at infinite distance from nucleus) is :

The number of radial and angular nodes in 4d orbital are, respectively

In a hydrogen atom, if energy of an electron in ground state is -13.6 eV, then that in the 2^nd excited state is

In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen

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

Ionisation energy of He⁺ is 19.6 x 10^–18 J atom^–1. The energy of the first stationary state (n = 1) of Li²⁺ is

Which of the following is the energy of a possible excited state of hydrogen?

The radius of the second Bohr orbit for hydrogen atom is: (Planck’s Const. h = 6.6262 × 10⁻³⁴ Js; mass of electron = 9.1091 × 10⁻³¹ kg; charge of electron (e) = 1.60210 × 10⁻¹⁹ C; permittivity of vacuum (${\varepsilon _0}$) = 8.854185 × 10⁻¹² kg⁻¹ m⁻³ A²)

The de-Broglie's wavelength of electron present in first Bohr orbit of 'H' atom is :

The radius of the second Bohr orbit, in terms of the Bohr radius, a₀, in Li²⁺ is :

The de Broglie wavelength of an electron in the 4th Bohr orbit is :

The difference between the radii of 3^rd and 4^th orbits of Li²⁺ is R₁ . The difference between the radii of 3^rd and 4^th orbits of He⁺ is $\Delta$R₂ . Ratio $\Delta$R₁ : $\Delta$R₂ is :

According to Bohr's atomic theory : (A) Kinetic energy of electron is $\propto {{{Z^2}} \over {{n^2}}}$. (B) The product of velocity (v) of electron and principal quantum number (n), $'vn' \propto {Z^2}$. (C) Frequency of revolution of electron in an orbit is $\propto {{{Z^3}} \over {{n^3}}}$. (D) Coulombic force of attraction on the electron is $\propto {{{Z^3}} \over {{n^4}}}$. Choose the most appropriate answer from the options given below :

Which of the following forms of hydrogen emits low energy $\beta$⁻ particles?

Given below are two statements : Statement I : Bohr's theory accounts for the stability and line spectrum of Li⁺ ion. Statement II : Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field. In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements. Statement I : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus. Statement II : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number. In the light of the above statements, choose the most appropriate answer from the options given below :