Question

Which of the following statement(s) is/are correct?

• A. Electrons in motion behave as if they are waves
• B. s-orbital is non-directional
• C. The energies of the various sub-levels in the same shell are in order s > p > d > f
• D. An orbital can accommodate a maximum of two electrons with parallel spins

Answer 1

Answer: (A), (B)

According to the quantum model of atom, electrons behave as waves as they are revolving with speed of light.
de Broglie suggested that like, electrons could act as both waves and particles.
The s-orbitals are non directional since they have spherical shape(symmetry) meaning that the probability of finding an electron is the same in all directions.