NEET Chemistry Questions: Structure of Atom

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Which of the following expressions imposes the condition of quantization of energy of an electron in an atom?




The expression $mvr = \frac{nh}{2\pi}$ imposes the condition of quantization of energy of an electron in an atom, where m is the mass of the electron, v is its velocity, r is the radius of the orbit, n is an integer (principal quantum number), and h is Planck's constant. This condition arises from the quantization of angular momentum.
The total number of electrons in a subshell designated by azimuthal quantum number, l is given as




No explanation available.
According to Bohr’s model of the atom, an electron can revolve around the atomic nucleus in a suitable orbit without emitting energy if its orbit




According to Bohr's model, an electron can revolve around the nucleus in a stable orbit without emitting energy if the orbit houses a whole number of de Broglie waves. This condition is known as the quantization of angular momentum.
According to Somerfield’s model, only circular orbit is possible for the electron in




According to Sommerfeld's modification of Bohr's atomic model, only circular orbits are possible for electrons in the K shell. For higher shells (L, M, N, etc.), elliptical orbits are also allowed.
According to Bohr’s atomic model




No explanation available.
The transition of electrons inH atom that will emit maximum energy is




No explanation available.
The limiting line in Balmer series will have a frequency of




No explanation available.
The wavelength of a spectral line for electron transition is inversely related to




The wavelength of a spectral line is inversely proportional to the energy difference between the initial and final energy levels involved in the electron transition. It is independent of the nuclear charge, electron velocity, and the number of electrons undergoing the transition.
The phenomenon of splitting of spectral lines under the influence of the electric field is known as




The Stark effect is the splitting or shifting of spectral lines of atoms or molecules due to the presence of an external electric field. It is named after Johannes Stark, who discovered this phenomenon in 1913.
If the energy of electron in H atom is given by expression, $ {- 1312 \over n^2 } kJ mol ^ {-1} $ , then the energy n2 required to excite the electron from ground state to second orbit is




No explanation available.
In the atomic spectrum of hydrogen, the spectral lines pertaining to electronic transition of n =4 to n =2 refers to




In the atomic spectrum of hydrogen, the Balmer series corresponds to the electronic transitions from higher energy levels (n ≥ 3) to the second energy level (n=2). Therefore, the spectral lines pertaining to the transition from n=4 to n=2 belong to the Balmer series.
If ionising energy of H atom is 13.6 eV, then the second ionising energy of He should be




The second ionization energy of an element is the energy required to remove an electron from the singly ionized atom. In the case of helium, the first ionization removes one electron, leaving He+ (singly ionized helium). The second ionization energy removes the remaining electron, giving He2+. Since helium has two electrons, the second ionization energy is simply twice the first ionization energy of hydrogen, which is 13.6 eV. Therefore, the second ionization energy of helium is 54.4 eV.
The first line in the Balmer series in the H atom will have the frequency




No explanation available.
How many electrons in $ {19}_ K $ have n =3; l = 0 ?




No explanation available.
The maximum number of electrons in s, p and d-subshells are




The maximum number of electrons that can be accommodated in s, p, and d subshells are 2, 6, and 10, respectively. This is based on the Aufbau principle and the Pauli exclusion principle.