Which of the following is characterized by existing at a discrete energy level? a) spin number b) atomic number c) orbital d) subatomic particle

The correct option is: D) Subatomic Particle

Explanation:

Electrons are the negatively charged, stable sub-atomic particles that exist in discrete energy levels, called the electron shells, around the nucleus of an atom.

Each electronic shell consists of a fixed number of electrons and these electronic shells are denoted by the symbol K, L, M, N, and so on.

Therefore, electron is the sub-atomic particle that exists at a discrete energy level.

it has both hydrogen and oxygen