Ernest Rutherford's atomic model included a nucleus comprised of positive particles called protons. Later, James Chadwick discovered neutrons. How did Chadwick's discovery change the atomic model?
A. The new model showed a negatively charged nucleus.
B. The new model showed a neutrally charged nucleus.
C. The new model showed a larger electron cloud.
D. The new model showed a nucleus with two types of particles.
Is the answer D?

Question

Ernest Rutherford's atomic model included a nucleus comprised of positive particles called protons. Later, James Chadwick discovered neutrons. How did Chadwick's discovery change the atomic model? 
A. The new model showed a negatively charged nucleus. 
B. The new model showed a neutrally charged nucleus. 
C. The new model showed a larger electron cloud. 
D. The new model showed a nucleus with two types of particles. 
Is the answer D?

dtan5457 · Answer

Yeah, I agree with you. They use to think it was just protons in the nucleus..but now that neutrons are discovered. You got two types of particles.