6. new terms\n1) the rings in the bohr model are called ______ or energy levels.\n2) the number of shells an…

6. new terms\n1) the rings in the bohr model are called ______ or energy levels.\n2) the number of shells an element has can be found using the row number in the ______. the number of electron shell is the same as the period number for representative elements.\n3) all electrons not in the highest energy level are called ______ electrons.\n4) all electrons in the highest energy level or outermost electron shell are called ______ electrons.\n5) to find the number of core electrons:\n a. total electrons - valence electrons = ______\n b. total electrons - core electron = ______\n6) complete the periodic table below by filling in the number of valence electrons in each column.\n|1a|2a|d - block|3a|4a|5a|6a|7a|8a|\n|----|----|----|----|----|----|----|----|----|\n|1 valence electron|valence electron|d - block|valence electron|valence electron|valence electron|valence electron|valence electron|valence electron|\n7. practice finding the number of core electrons, valence electrons and number of energy level. use your periodic table to identify the # of core electrons, valence electrons\n| |lithium, ₃li|sodium, ₁₁na|oxygen, ₈o|neon, ₁₀ne|\n|----|----|----|----|----|\n|# core electrons| | | | |\n|# valence electron| | | | |\n|total # electron| | | | |

6. new terms\n1) the rings in the bohr model are called ______ or energy levels.\n2) the number of shells an element has can be found using the row number in the ______. the number of electron shell is the same as the period number for representative elements.\n3) all electrons not in the highest energy level are called ______ electrons.\n4) all electrons in the highest energy level or outermost electron shell are called ______ electrons.\n5) to find the number of core electrons:\n a. total electrons - valence electrons = ______\n b. total electrons - core electron = ______\n6) complete the periodic table below by filling in the number of valence electrons in each column.\n|1a|2a|d - block|3a|4a|5a|6a|7a|8a|\n|----|----|----|----|----|----|----|----|----|\n|1 valence electron|valence electron|d - block|valence electron|valence electron|valence electron|valence electron|valence electron|valence electron|\n7. practice finding the number of core electrons, valence electrons and number of energy level. use your periodic table to identify the # of core electrons, valence electrons\n| |lithium, ₃li|sodium, ₁₁na|oxygen, ₈o|neon, ₁₀ne|\n|----|----|----|----|----|\n|# core electrons| | | | |\n|# valence electron| | | | |\n|total # electron| | | | |

Answer

Explanation:

Step1: Recall Bohr - model terms

In the Bohr Model, the "rings" are called electron shells or energy levels.

Step2: Determine shell - finding method

The number of shells an element has can be found using the row number in the periodic table.

Step3: Define electron types

Electrons not in the highest energy level are called core electrons. Electrons in the highest energy level or outermost electron shell are called valence electrons.

Step4: Calculate core electrons

To find the number of core electrons, we use the formula: Total electrons - valence electrons = core electrons. Also, Total electrons - core electrons = valence electrons.

Step5: Fill periodic - table valence - electron numbers

For group 1A, the number of valence electrons is 1; for group 2A, it is 2; for group 3A, it is 3; for group 4A, it is 4; for group 5A, it is 5; for group 6A, it is 6; for group 7A, it is 7; for group 8A, it is 8. For the d - block elements, the number of valence electrons can vary but is generally 2 (with some exceptions due to involvement of d - electrons in bonding).

Step6: Find electron numbers for given elements

  • Lithium ($Li$): Atomic number = 3. Total electrons = 3. It is in group 1A, so valence electrons = 1. Core electrons = 3 - 1=2.
  • Sodium ($Na$): Atomic number = 11. Total electrons = 11. It is in group 1A, so valence electrons = 1. Core electrons = 11 - 1 = 10.
  • Oxygen ($O$): Atomic number = 8. Total electrons = 8. It is in group 6A, so valence electrons = 6. Core electrons = 8 - 6 = 2.
  • Neon ($Ne$): Atomic number = 10. Total electrons = 10. It is in group 8A, so valence electrons = 8. Core electrons = 10 - 8 = 2.

Answer:

  1. Electron Shells
  2. Periodic Table
  3. Core
  4. Valence
  5. a. Core electrons; b. Valence electrons
  6. 1A: 1; 2A: 2; d - block: 2 (general); 3A: 3; 4A: 4; 5A: 5; 6A: 6; 7A: 7; 8A: 8
Element # core electrons # valence electrons Total # electrons
Lithium ($Li$) 2 1 3
Sodium ($Na$) 10 1 11
Oxygen ($O$) 2 6 8
Neon ($Ne$) 2 8 10