Atomic Structure MCQs for NEET — Chemistry Questions with Answers

When sodium chloride is introduced into a Bunsen flame, the heat energy is absorbed by the sodium atoms, promoting their electrons to higher energy levels. As the excited electrons return to their ground state, they emit excess energy as radiation in the visible region, specifically a yellow color.

The statement that the exact path of an electron in a 2p orbital cannot be determined is based on the Heisenberg Uncertainty Principle. This principle states that it is impossible to simultaneously determine the exact position and momentum (or velocity) of a particle with absolute precision.

The maximum number of electrons in a subshell is given by the expression 4l + 2, where l is the azimuthal quantum number. This is known as the 'Pauli Exclusion Principle', which states that no two electrons in an atom can have the same set of four quantum numbers.

The energy of the hydrogen atom in its ground state (n=1) is -13.6 eV. The energy of the level corresponding to the quantum number n is given by E = (-13.6 eV)/n^2. For n=5, the energy will be (-13.6 eV)/5^2 = 0.54 eV.

Hund's rule states that for degenerate orbitals (orbitals with the same energy), the electrons occupy the orbitals in such a way that their spins are parallel, maximizing the total spin multiplicity. This rule is based on the principle of maximum multiplicity, which leads to greater stability.

According to the Heisenberg Uncertainty Principle, the position and momentum of a particle cannot be measured with absolute precision simultaneously. If the uncertainty in the position of an electron is zero, it implies that its position is known exactly, leading to an infinite uncertainty in its momentum.