Questions | Answer | Explanations |
| 1 In the modern wave-mechanical model of the atom, the orbitals are regions of the most probable location of (1) protons (3) electrons (2) neutrons (4) positrons | 3 | orbitals--> electrons |
| 2 Compared to a proton, an electron has (1) a greater quantity of charge and the same sign (2) a greater quantity of charge and the opposite sign (3) the same quantity of charge and the same sign (4) the same quantity of charge and the opposite sign | 4 | protons +1 electrons -1 |
 | 1 | Must have different mass numbers (top number) and have same atomic number (bottom number) |
| 4 The elements in Period 5 on the Periodic Table are arranged from left to right in order of (1) decreasing atomic mass (2) decreasing atomic number (3) increasing atomic mass (4) increasing atomic number | 4 | atomic number-look at your periodic table |
| 5 Which list of elements contains a metal, a metalloid, and a nonmetal? (1) Zn, Ga, Ge (3) Cd, Sb, I (2) Si, Ge, Sn (4) F, Cl, Br | 3 | Sb is the metalloid left side of the staircase metals right side is nonmetals |
| 6 An example of a physical property of an element is the element’s ability to (1) react with an acid (2) react with oxygen (3) form a compound with chlorine (4) form an aqueous solution | 4 | physical properties do not change what it is (not a reaction) |
| 7 Which element is malleable and conducts electricity? (1) iron (3) sulfur (2) iodine (4) phosphorus | 1 | definition of a metal |
| 8 At STP, solid carbon can exist as graphite or as diamond. These two forms of carbon have (1) the same properties and the same crystal structures (2) the same properties and different crystal structures (3) different properties and the same crystal structures (4) different properties and different crystal structures | 4 | different properties different structures |
| 9 What is the formula of titanium(II) oxide? (1) TiO (3) Ti2O (2) TiO2 (4) Ti2O3 | 1 | Ti is 2+ and O is 2- TiO |
| 10 Which substance can be decomposed by a chemical change? (1) calcium (3) copper (2) potassium (4) ammonia | 4 | Definition of a COMPOUND |
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