An atom contains 3 protons, 3 electrons, and 4 neutrons. Which of the following statements
correctly describes the nucleus of this atom?
A the nucleus contains 3 positively charged particles
B the nucleus contains 3 negatively charged particles
C the nucleus contains 3 positively charged particles and 4 neutrally charged particles
D the nucleus contains 3 negatively charged particles and 4 neutrally charged particles