Atomic Structure MCQs for NEET — Chemistry Questions with Answers

The principal quantum number (n) determines the energy level, and higher values of n correspond to higher energy levels. The orbital angular momentum quantum number (l) can have values from 0 to n-1. The magnetic quantum number (m) can have values from -l to +l. The spin quantum number (s) can have values of +1/2 or -1/2.

According to Bohr's theory, the energy of an electron in a hydrogen atom is given by E = -13.6 eV/n^2, where n is the principal quantum number. The energy difference between n=6 and n=8 is less than the energy difference between n=5 and n=7, as the energy levels get closer together for higher values of n.

The de Broglie wavelength of a particle is given by λ = h / (mv), where h is Planck's constant, m is the mass of the particle, and v is its velocity. For an electron with kinetic energy of 2.14 × 10^-22 J, we can calculate its velocity using the relation KE = (1/2)mv^2. Substituting the values, we get λ = 9.28 × 10^-8 m.

The Balmer series in the hydrogen spectrum corresponds to the electron transitions from higher energy levels to the second energy level (n=2). The third line in the Balmer series is due to the transition from the fifth orbit (n=5) to the second orbit (n=2).

Rutherford's alpha particle scattering experiment led to the discovery of the atomic nucleus. His model proposed that the positive charge and most of the mass of an atom is concentrated in a tiny region called the nucleus, surrounded by empty space with orbiting electrons.