PRE-TEST Directions: Read each statement carefully. Encircle the letter of the correct answer. 1. Which of the following atomic models is proposed by Emest d a b Rutherford as a result of his alpha-scattering experiment? 2. He concluded from his studies and experiment that the electrons are moving on its orbits with specific energies around the nucleus called energy level, a a. Dalton b. Thomson c. Rutherford d. Bohr 3. A Ca2+ ion differs from a Cao atom in that the Ca2+ ion has a a. more electrons c. fewer electrons b. fewer protons d. no electrons 4. When the number of electrons is less than the number of proton, the charge of the jon is a. positive c. negative b. Neutral d. no charge 5. Isotopes of an atom may exist naturally. Which statement best describes isotopes? a, atoms of the same elements having different atomic masses b. atoms of different elements having the same mass number c. Atoms of different elements d. Atoms of the same elements​