number of particles relative mass of particles types of particles present charges of particles present
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A teacher builds a model of a hydrogen atom. A red golf ball is used for a proton, and a green golf ball is used for an electron. Which is not accurate concerning the model?
Possibilities:
- number of particles
- relative mass of particles
- types of particles present
- charges of particles present

relative mass of particles