Question

identifying parts of an atom
identify the parts of the atom that are labeled in the
diagram.
label a:
label b:

Explanation:

In an atom's structure, the central dense part (nucleus) contains protons and neutrons (label A here represents the nucleus, or more specifically, the protons and neutrons within it). The circular path with small particles (electrons) is the electron shell or energy level (label B is the electron shell/energy level where electrons orbit, or the electron itself in the orbit). Typically, the nucleus (protons + neutrons) is at the center, and electrons orbit in shells. So Label A: Nucleus (or Protons and Neutrons), Label B: Electron Shell (or Energy Level, or Electron).

Answer:

Label A: Nucleus (or Protons and Neutrons)
Label B: Electron Shell (or Energy Level, or Electron)