Activity 2: "Count Me! Find Me!" Given the electron configuration of the elements, find out the number of electrons in the outermost level. 1. 3. 2345 5. 17 CI-1s2 2s2 2p6 3s² 3p5 20 Ca - 1s2 2s2 2p6 3s² 3p6 4s2 80-1s2 2s2 2p4 13AI - 1s² 2s² 2p6 3s² 3p1 36Kr - 1s² 2s2 2p6 3s² 3p6 4s² 3d10 4p6
Answer (1)
Answer:Here's the breakdown of the electron configurations and the number of electrons in the outermost level for each element: 1. Cl (Chlorine) - 1s² 2s² 2p⁶ 3s² 3p⁵Outermost level: 3 (the highest energy level)Number of electrons in the outermost level: 7 (2 in the 3s subshell and 5 in the 3p subshell) 2. Ca (Calcium) - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²Outermost level: 4 (the highest energy level)Number of electrons in the outermost level: 2 (in the 4s subshell) 3. Hg (Mercury) - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰Outermost level: 6 (the highest energy level)Number of electrons in the outermost level: 2 (in the 6s subshell) 4. Al (Aluminum) - 1s² 2s² 2p⁶ 3s² 3p¹Outermost level: 3 (the highest energy level)Number of electrons in the outermost level: 3 (2 in the 3s subshell and 1 in the 3p subshell) 5. Kr (Krypton) - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶Outermost level: 4 (the highest energy level)Number of electrons in the outermost level: 8 (2 in the 4s subshell and 6 in the 4p subshell) Key Knowledge:Electron Configuration: The arrangement of electrons in an atom's energy levels and sublevels.Outermost Level: The highest energy level occupied by electrons in an atom.Valence Electrons: The electrons in the outermost level, which are involved in chemical bonding.
