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.

the volume increases

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.