Question

fig. 2.1
○ prions
○ electrons
○ neutrons
○ protons

Explanation:

In the atomic model, electrons are negatively charged particles that orbit the nucleus in electron shells. The particles shown on the orbits (the rings around the nucleus) have a negative charge (-), which matches the properties of electrons. Prions are infectious proteins and not part of atomic structure. Neutrons are neutral (no charge) and protons are positive (+), both located in the nucleus, not in the orbits.

Answer:

B. electrons