Question

Which of the following statements is true?

1. quantum numbers n, l, and ml denote the size, shape, and orientation, respectively, of each atomic orbital

2. the Pauli Exclusion Principle states that no two electrons in neighboring atoms can have the same set of four quantum numbers

3. according to Bohr's model of the atom, an atomic spectrum consists of separate lines because an atom has certain allowable orientations in space

4.the Heisenberg Uncertainty Principle states that it is impossible to determine accurately both the momentum and the energy of a particle simultaneously

Answer 1

Ans:- Option (1) i.e "quantum numbers n, l, and m denote the size, shape, and orientation, respectively, of each atomic orbital" is the correct answer.

Explanation :- n = Principal quantum number which gives the size of the atomic orbital.

l = Azimuthal orbital quantum number which gives the shape of the atomic orbital and  

m = Magnetic quantum number which gives the orientation of atomic orbitals.

option (2) is incorrect because "The Pauli Exclusion Principle states that no two electrons in an orbital can have the same set of four quantum numbers".

option (3) is incorrect .

option (4) is incorrect because " the Heisenberg Uncertainty Principle states that it is impossible to determine accurately both the momentum and the position of a moving microscopic particle simultaneously.