Question

Which of the following statements are true regarding an orbital?

• A. Orbital corresponds to stationary orbit of Bohr
• B. Orbitals indicate the velocity of the electron in three dimensional space
• C. All the electrons in the singly occupied orbitals have same spin
• D. Orbitals of the same energy are degenerate under normal conditions

Answer 1

Answer: (A), (D)

The correct options are
A Orbital corresponds to stationary orbit of Bohr
D Orbitals of the same energy are degenerate under normal conditions

The electrons filling a subshell will have a parallel spin before the shell starts filling up with the opposite spin electrons. Orbitals contain electrons with opposite spin.

The stationary orbits of Bohr are called energy shells or energy levels indicated by principal quantum number $n$.