Grade 8 Chemistry Past Paper PDF

**Name:** **Score:** **Grade & Section:** **Date:** **ACHIEVEMENT TEST IN CHEMISTRY 8 - PERIODIC TABLE OF ELEMENTS** **Directions:** Read the questions carefully then encircle the letter of the best answer. **1.** What is the primary purpose of the periodic table?\ A. To list all known compoun...

**Name:** **Score:** **Grade & Section:** **Date:** **ACHIEVEMENT TEST IN CHEMISTRY 8 - PERIODIC TABLE OF ELEMENTS** **Directions:** Read the questions carefully then encircle the letter of the best answer. **1.** What is the primary purpose of the periodic table?\ A. To list all known compounds\ B. To organize elements based on their atomic number and properties\ C. To show the arrangement of electrons in an atom\ D. To explain chemical reactions **2.** Which of the following determines an element\'s chemical behavior?\ A. Atomic mass\ B. Proton count\ C. Electron arrangement\ D. Neutron number **3.** Elements in the same group (column) of the periodic table have similar chemical properties because they:\ A. Have the same atomic number\ B. Have the same number of protons\ C. Have the same number of valence electrons\ D. Have the same number of neutrons **4.** Which group contains the most reactive metals?\ A. Group 1 (Alkali metals)\ B. Group 2 (Alkaline earth metals)\ C. Group 7 (Halogens)\ D. Group 18 (Noble gases) **5.** Which element is most likely to form a positive ion?\ A. Fluorine\ B. Oxygen\ C. Sodium\ D. Argon **6.** Which group is known for its inert and stable elements?\ A. Group 1\ B. Group 7 C. Group 8\ D. Group 18 **7.** Chlorine (Cl) belongs to Group 17. What type of ion does it typically form?\ A. +1\ B. +2\ C. -1\ D. -2 **8.** What is the most likely chemical behavior of a noble gas like neon?\ A. It readily gains electrons\ B. It readily loses electrons\ C. It rarely reacts with other elements\ D. It forms ionic bonds easily **9.** Elements in the same period (row) of the periodic table:\ A. Have the same number of valence electrons\ B. Have the same number of electron shells\ C. Have similar chemical properties\ D. Belong to the same group **10.** Which of the following is a property of alkali metals?\ A. High density\ B. High reactivity with water\ C. Low electrical conductivity\ D. Nonmetallic behavior **11.** Which element is a nonmetal and a halogen?\ A. Sodium\ B. Bromine\ C. Calcium\ D. Neon **12.** An element with an atomic number of 12 belongs to which group?\ A. Alkali metals\ B. Alkaline earth metals\ C. Halogens\ D. Noble gases **13.** Which element is more reactive, potassium (K) or lithium (Li), and why?\ A. Lithium, because it has fewer protons\ B. Lithium, because it has more neutrons\ C. Potassium, because its valence electron is farther from the nucleus\ D. Potassium, because it has more protons **14.** Which element is more reactive, fluorine (F) or chlorine (Cl), and why?\ A. Fluorine, because it has a smaller atomic radius\ B. Fluorine, because it has more protons\ C. Chlorine, because it has more valence electrons\ D. Chlorine, because it has a larger atomic radius **15.** What happens to the reactivity of alkali metals as you go down Group 1?\ A. Increases\ B. Decreases\ C. Stays the same\ D. Becomes unpredictable **16.** How does the reactivity of halogens change as you go down Group 17?\ A. Increases\ B. Decreases\ C. Stays the same\ D. Becomes unpredictable **17.** Which of the following elements is least reactive?\ A. Sodium\ B. Calcium\ C. Helium\ D. Fluorine **18.** Which of the following describes a metalloid?\ A. Good conductor of electricity\ B. Brittle and non-conductive\ C. Exhibits properties of both metals and nonmetals\ D. Completely inert **19.** What trend is observed in atomic radius as you move across a period from left to right?\ A. It increases\ B. It decreases\ C. It stays the same\ D. It varies unpredictably **20.** What trend is observed in ionization energy as you move across a period from left to right?\ A. It increases\ B. It decreases\ C. It stays the same\ D. It varies unpredictably **21.** What type of bond forms between elements in Group 1 and Group 17?\ A. Covalent bond\ B. Ionic bond\ C. Metallic bond\ D. Hydrogen bond **22.** Which of the following elements is most likely to conduct electricity?\ A. Sulfur\ B. Phosphorus\ C. Aluminum\ D. Argon **23.** If an element has 7 valence electrons, which group does it belong to?\ A. Group 1\ B. Group 7\ C. Group 17\ D. Group 18 **24.** Which of the following is a transition metal?\ A. Sodium\ B. Magnesium\ C. Iron\ D. Neon **25.** Which periodic trend explains why fluorine is highly reactive?\ A. Low ionization energy\ B. High electronegativity\ C. Large atomic radius\ D. Low electron affinity **Answer Key:** **1.** B. To organize elements based on their atomic number and properties\ **2.** C. Electron arrangement\ **3.** C. Have the same number of valence electrons\ **4.** A. Group 1 (Alkali metals)\ **5.** C. Sodium\ **6.** D. Group 18\ **7.** C. -1\ **8.** C. It rarely reacts with other elements\ **9.** B. Have the same number of electron shells\ **10.** B. High reactivity with water\ **11.** B. Bromine\ **12.** B. Alkaline earth metals\ **13.** C. Potassium, because its valence electron is farther from the nucleus\ **14.** A. Fluorine, because it has a smaller atomic radius\ **15.** A. Increases\ **16.** B. Decreases\ **17.** C. Helium\ **18.** C. Exhibits properties of both metals and nonmetals\ **19.** B. It decreases\ **20.** A. It increases\ **21.** B. Ionic bond\ **22.** C. Aluminum\ **23.** C. Group 17\ **24.** C. Iron\ **25.** B. High electronegativity