Atomic Theory and Structure Atomic Theory I (previous version): The Early Years by Anthony Carpi, Ph.D. Reading Quiz Teach with this Who was the first person to suggest that the atom was made up of smaller parts? James Chadwick John Dalton Ernest Rutherford J.J. Thomson Cathode rays are beams of: alpha particles electrons protons neutrons Based on his experiments, what did Rutherford propose? Atoms are mostly empty space. Atoms had a dense nucleus. The nucleus is positively charged. All of the above. The proton has: the same charge and the same mass as the electron the same charge and a smaller mass than the electron the opposite charge and a larger mass than the electron the opposite charge and a smaller mass than the electron The neutron has: no charge and about the same size as a an electron no charge and about the same size as a proton about the same size and charge as an electron about the same size and charge as a proton The experiment that confirmed the existence of neutrons was performed by: James Chadwick Marie Curie John Dalton Ernest Rutherford How many protons are in the helium atom? one two four five The number of protons in an atom is called the: nucleus atomic mass atomic number atomic weight Which of the following is a valid definition of atomic weight? Atomic weight is: the number of electrons in an atom the number of protons and electrons the number of protons in an atom the number of protons and neutrons Which is the correct organization of the subatomic particles in an atom? Electrons reside inside of a small nucleus. Protons and neutrons revolve around the nucleus. Protons and electrons reside inside of a small nucleus. Neutrons revolve around the nucleus. Protons and neutrons reside inside of a small nucleus. Electrons revolve around the nucleus. Protons and electrons reside inside of a small nucleus. Neutrons revolve around the nucleus. The electron has a: negative charge and relatively large mass negative charge and relatively small mass positive charge and relatively large mass positive charge and relatively small mass What is the atomic mass of helium? one two four six Score Quiz