Instructions. Read and understand each item and choose the letter of the CORRECT answer. Write your answer in the space provided. _____1. Which of the following is NOT an evidence of star formation? A. hydrogen C. infrared radiation B. helium D. rocks _____2. Which process produced Star’s energy? A. combustion B. decomposition C. nuclear fission D. nuclear fusion _____3. In main sequence star, Hydrogen fuses and converted to Helium and Helium is converted into ___ at its core. A. carbon B. iron C. neon D. silicon _____4. This element is produced through Big Bang Nucleosynthesis second most abundant element in the universe. A. carbon B. helium C. hydrogen D. oxygen _____5. What object is formed from gas and dust particles which are pulled together by gravity and no nuclear fusion has happened yet? nebula B. main sequence star C. protostar D. red supergiant star _____6. Which of the following terms refer to the ability of an atom in a molecule to attract shared electrons? Electron affinity C. Ionization energy Electronegativity D. Electromotive force _____7. Which is TRUE about polar bonds? They are present in metals. They are responsible for the formation of ionic compounds. They always result in the formation of polar molecular compounds. ​