Jhil Exam Which correctly identifies the structure labeled X in the diagram?
It's a proton, which has a negative charge and stays in the cloud outside the nucleus.
It's a positively-charged electron, which has the same mass as a proton.
O It's neutrally-charged neutron, which has the same mass as a proton.
O It's an electron, which has a negative charge and has a mass much less than a proton.