1) Which of the following sublevel/s are in the third energy level? a) s b) s, p c) s, p, d d) s, p, d, f 2) Which of the following states that when electrons occupy orbitals of equal energy, one electron enters each orbital until all orbitals contain one electron with their spins parallel? a) Hund’s Rule b) Aufbau Principle c) Dalton’s Theory d) Pauli Exclusion Principle 3) What is the maximum number of electrons that can occupy in the second energy level? a) 2 b) 8 c) 18 d) 32 4) Which is the electron configuration of Oxygen (8e-)? a) b) c) d) 5) Which of the following states that no more than two electrons can occupy an atomic orbital? an atomic orbital? a) Hund’s Rule b) Dalton’s Theory c) Aufbau Principle d) Pauli Exclusion Principle 6) Copper chloride when heated emits blue light. What is the origin of this light? a) The nucleus radiates energy. b) The electron loses energy as it moves around the nucleus. c) The electron absorbs energy as it jumps to a higher energy level. d) An excited electron loses energy as it returns to a lower energy level 7) Which statement below supports the Bohr’s model of the atom? a) The model accounted for the absorption spectra of atoms but not for the emission spectra. b) The model was accounted for describing the electron to be moving in definite orbits around the nucleus. c) The model was based on the wave properties of the electron. d) The model accounted for the emission spectra of atoms, but not for the absorption spectra. 8) Which type of compound results from the combination of metal and nonmetal elements? a) Ionic compounds b) Covalent molecular compounds c) Organic compounds d) Acids and Bases 9) Which type of compounds results from the combination of two non- metallic elements? a) Ionic compounds b) Covalent molecular compounds c) Organic compounds d) Acids and Bases 10) Which of the following compounds is covalent? a) Sodium Hydroxide b) Table sugar c) Barium chloride d) Table salt 11) All of the following describes ionic compounds except: a) They form crystals. b) They are hard and brittle. c) They have high melting and boiling points d) It possesses polar and nonpolar characteristics table salt 12) Which of the following example is ionic in nature? a) CO2 b) H2O c) NaCl d) C12H22O11 13) Which of the following explains the flammability of covalent molecula compounds? a) Molecules easily react with heat-producing flames. b) They contain carbon and hydrogen atoms that react readily with oxygen gas. c) Covalent molecular compounds share their electrons forming polar and nonpolar bonds. d) Because they generally have low melting and boiling points and the addition of a small amount of energy causes intermolecular attraction to break. 14) Why are ionic compounds good conductors of electricity? a) Ionic compounds are electrical b) The strong electrostatic attraction between ions allows electricity to flow freely c) Aqueous solutions of ionic compounds cause ions to dissociate and are free to conduct electricity. d) Strong electrostatic attraction between crystal lattice of ionic compounds is strong which needs high temperature to melt or boil these compounds. 15) Element X belongs to Group 1. Which of the following best describes element X? a) high electronegativity b) low electronegativity c) high ionization energy d) a non-metallic element 16) An atom that has lost a valence electron, so it is positively charged. a) anion b) cation c) ion d) isoelectronic 17) When does Calcium follow the octet rule when reacting to form a compound? a) When it gains electron b) When it gives up electron c) When it absorbs energy d) When it does not change its number of electrons 18) What will most likely happen to a non-metallic atom after ionic bonding? a) It forms a cation and anion b) It forms an anion and become stable c) It becomes stable and later become unstable d) It forms a cation and become unstable 19) Which among the following shows that an atom is stable? a) having 2 valence electrons b) having 4 valence electrons c) having 6 valence electrons d) having 8 valence electrons 20) Which of the following is TRUE? a) Ions are formed by the addition of electrons to atoms, or molecules or other ions. b) Ions are formed by the removal of electrons to atoms, or molecules or other ions. c) Sodium transfer its only electron to attain stability. d) All of the above 21) Which of the following statement is TRUE in ionic bonding? a) Metals form cations because they completely transfer or give away electrons. b) Metals form cations because they partially transfer electrons. c) Metals form anions because they completely transfer or give away electrons. d) Metals form anions because they partially transfer electrons. 22) How many electrons does a carbon atom have? a) 4 b) 6 c) 7 d) 8 23) Carbon is so important because its atomic structure gives it bonding properties that are unique among elements. Carbon can bond to? a) H b) N c) O d) all of the above 24) One of the softest materials known, and is a form of carbon that is primarily used as a lubricant. a) coke b) graphite c) buckyballs d) diamond 25) What is called “black tar residue remaining” after the refinement of crude oil, in an oxygen-free oven. a) coke b) graphite c) buckyballs d) diamond

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