4. Which two particles would be attracted to each other? A. protons and neutrons B. electrons and protons C. electrons and neutrons D. All particles are attracted to each other. 5. Which of the following statements are TRUE about the subatomic particles? 1. The charge of electron is opposite to the charge of proton. II. Proton has approximately the same mass with neutron. III. Electrons and protons are located within the nucleus. IV. The mass of an atom is concentrated at the nucleus. A. 1, II, and II B. 1, II, and IV C. I, II, and IV D. 1, II, II, and IV 6. What was Thomson's atomic model called? A. Spherical Model B. Solar System Model C. Plum Pudding Model D. Model of the Atomic Theory 7. Which of the following statements BEST describes the location of electrons in Rutherford's model of the atom? A. The electrons are inside the nucleus. B. The electrons are outside the nucleus. C. There are no electrons in the Rutherford Model. D. Electrons are both inside and outside of the nucleus. 8. How do we call the protons and neutrons that are found together in the nucleus? A. nuclei B. nucleons C. atomic mass D. mass number

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Atomic Number

Elements are the building blocks of all the matter that exist in the universe. Every element is made up of atoms that have protons, electrons, and a nucleus. In order to know the difference between the elements, an atomic number is used. Every element has its own individual atomic number. The atomic number is a single most important characteristic of an atom.