SCIENCE 9 QUARTER 2 DIAGNOSTIC TEST Read each item carefully and write the letter of the correct answer in a clean sheet of paper. 1. Which of the following models describe a space or region where electron is most likely to be found? A. Bohr’s model C. Nuclear model B. Plum-pudding model D. Quantum mechanical model 2. If the first and second energy levels of an atom are full, then what would be the total number of electrons in the atom? A. 6 B. 8 C. 10 D.18 3. The symbol “n” in the Bohr theory of atomic structure refers to _________ A. the energy of electron C. the number of electron in an energy level B. the total energy of the atom D. the orbit in which an electron is found. 4. Which orbital designation has the highest energy? A. 2s B.2p C. 3d D. 4s 5. How many orbitals are in the third principal energy level? A. 3 B. 6 C. 9 D. 12