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ELECTRONS AND ENERGY LEVELS Name ___________________________________ Date______ Period ___ 1. The lowest allowable energy state of an atom is called its ___________________________________________ 2. According to Bohr’s atomic model, the smaller an electron’s orbit, the ______________ the atom’s energy level. 3. According to Bohr’s atomic model, the larger an electron’s orbit, the _________________the atom’s energy level. 4. The electrons in an atom’s outermost orbitals are called _______________________________________ 5. In an electron-dot structure, the element’s symbol represents the __________________ ___________________ 6. Which electrons are represented by the dots in an electron-dot structure? _________________________________ 7. 8. 9. Which sublevel s or p has higher energy? Why? For each of the following values of n, indicate the number and types of sublevels possible for that main energy level a) n=1__________ b) n=2__________ c) n=3___________ In your own words define the relationship between n and the total number of sublevels in the main energy level? 10. According to the Bohr model, how do electrons move in atoms? _____________________________________ 11. What is an atomic orbital?_____________________________________________________________________ 12. What are valence electrons? _______________________________________________________ ______________________________________________________________________________ How many of a chlorine atom’s 17 electrons are valence electrons? ____________________ 13. Draw electron-dot structures for atoms of the following elements. Mg S Br Xe ========================================================================= ELECTRONS AND ENERGY LEVELS Name ___________________________________ Date______ Period ___ 1. The lowest allowable energy state of an atom is called its ___________________________________________ 2. According to Bohr’s atomic model, the smaller an electron’s orbit, the ______________ the atom’s energy level. 3. According to Bohr’s atomic model, the larger an electron’s orbit, the _________________the atom’s energy level. 4. The electrons in an atom’s outermost orbitals are called _______________________________________ 5. In an electron-dot structure, the element’s symbol represents the __________________ ___________________ 6. Which electrons are represented by the dots in an electron-dot structure? _________________________________ 7. 8. 9. Which sublevel s or p has higher energy? Why? For each of the following values of n, indicate the number and types of sublevels possible for that main energy level a) n=1__________ b) n=2__________ c) n=3___________ In your own words define the relationship between n and the total number of sublevels in the main energy level? 10. According to the Bohr model, how do electrons move in atoms? _____________________________________ 11. What is an atomic orbital?_____________________________________________________________________ 12. What are valence electrons? _______________________________________________________ ______________________________________________________________________________ How many of a chlorine atom’s 17 electrons are valence electrons? ____________________ 13. Draw electron-dot structures for atoms of the following elements. Mg S Br Xe 14. Write ground-state electron configurations for the following elements. a. Chlorine _________________________________________________ b. Silicon _________________________________________________ c. Carbon _________________________________________________ 15. What elements are represented by each of the following electron configurations? 1s2 2s2 2p5 _____________________ 1s2 2s2 2p2 _____________________ 1s2 2s1 ________________________ 16. Find a mistake and write a correct configuration 1s2 2s1 2p4 _________________________ 2s2 3s2 2p6 3p5 ________________________ Write the electron configuration notation for an element that contains the following number of electrons a) 3 ________________________________ 17. b) 6 ________________________________ c) 8 ________________________________ d) 13 _______________________________ Challenging quetion 18. What is noble-gas notation, and why is it used to write electron configurations? _____________________________________________________________________________________________ ____________________________________________________________________________________________ _____________________________________________________________________________________________ Write noble gas notation for the above atoms 14. Write ground-state electron configurations for the following elements. d. Chlorine _________________________________________________ e. Silicon _________________________________________________ f. Carbon _________________________________________________ 15. What elements are represented by each of the following electron configurations? 1s2 2s2 2p5 _____________________ 1s2 2s2 2p2 _____________________ 2 1 1s 2s ________________________ 16. Find a mistake and write a correct configuration 1s2 2s1 2p4 _________________________ 2s2 3s2 2p6 3p5 ________________________ Write the electron configuration notation for an element that contains the following number of electrons a) 3 ________________________________ 17. b) 6 ________________________________ c) 8 ________________________________ d) 13 _______________________________ Challenging quetion 18. What is noble-gas notation, and why is it used to write electron configurations? _____________________________________________________________________________________________ ____________________________________________________________________________________________ _____________________________________________________________________________________________ Write noble gas notation for the above atoms ================= Not used 2011 19. The arrangement of electrons in an atom is called the atom’s (1)_____________________________ . Electrons in an atom tend to assume the arrangement that gives the atom the (2) _____________________possible energy. This arrangement of electrons is the most (3) _______________________arrangement and is called the atom’s (4) _______________________________________ 20. What is the difference between an atom’s ground state and an excited state? ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ 21. Bohr proposed that when energy is added to a hydrogen atom, its ___________________________moves to a higher-energy orbit