Structure of Atom

In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainity
with which the position of the electron can be located is (h = 6.6 \(\times\) 10-34 kg m2s-1, mass of electron, em = 9.1 \(\times\) 10-31 kg)

The ionization enthalpy of hydrogen atom is 1.312 × 106 J mol−1. The energy required to excite the
electron in the atom from n = 1 to n = 2 is

Which one of the following constitutes a group of the isoelectronic species?

Which of the following sets of quantum numbers represents the highest energy of an atom?

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

Which of the following sets of ions represents a collection of isoelectronic species?

Uncertainty in the position of an electron (mass = 9.1 \(\times\) 10-31 kg) moving with a velocity 300 ms-1, accurate upto 0.001% will be (h = 6.63 \(\times\) 10-34 Js)

Pick out the isoelectronic structure from the following :
$$\eqalign{
& \left( i \right)\,\,\,\,\,\,C{H_3}^ + \cr
& \left( {ii} \right)\,\,\,\,{H_3}{O^ + } \cr
& \left( {iii} \right)\,\,\,N{H_3} \cr
& \left( {iv} \right)\,\,...

Of the following sets which one does NOT contain isoelectronic species?

In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields?
(A) n = 1, l = 0, m = 0
(B) n = 2, l = 0, m = 0
(C) n = 2, l = 1, m =...

Which one of the following sets of ions represents the collection of isoelectronic species? (Atomic nos. : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

The wavelength of the radiation emitted when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097 \(\times\) 107 m-1)

Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum numbers, l = 1 and 2 are respectively

Which of the following sets of quantum numbers is correct for an electron in 4f orbital?

The orbital angular momentum for an electron revolving in an orbit is given by \(\sqrt {l(l + 1)} {h \over {2\pi }}\). This momentum for an s-electron will be given by

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

Which one of the following groupings represents a collection of isoelectronic species? (At. nos. : Cs : 55, Br : 35)

The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 meters per second is approximately

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

Uncertainty in position of a minute particle of mass 25 g in space is 10-5 m. What is the uncertainty in its velocity (in ms-1) (h = 6.6 \(\times\) 10-34 Js)