1) What is the electron configuration of a potassium atom (atomic number 19) at ground state? a) 1s2 2s2 2p6 3s2 3p6 4d1 b) 1s2 2s2 2p6 3s2 3p6 3d1 c) 1s2 2s2 2d6 3s2 3d6 4s1 d) 1s2 2s2 2p6 3s2 3p6 4s1 2) An orbital can at most hold how many electrons? a) 1 electron b) 2 electrons c) 3 electrons d) 4 electrons 3) The vanadium atom (atomic number 23) in its ground state has the electronic configuration: a) 1s2 2s2 2p6 3s2 3p6 3d3 4s2 b) 1s2 2s2 2p6 3s2 3p6 3d2 4s3 c) 1s2 2s2 2p6 3s2 3p6 3d1 4s2 4p2 d) 1s2 2s2 2p6 3s2 3p6 3d4 4s2 4) What is the abbreviated electronic configuration for Scandium (atomic number 21) a) [Ne] 3s2 3p6 4s2 b) [Ar] 4s2 3d1 c) [Ar] 4s2 3d2 d) [Ne] 4s2 3d1 5) Which of the rule is being ignored in the orbital diagram shown above. a) Aufbau principle b) Hund's rule c) The Pauli's exclusion principle d) Heisenberg uncertainty principle 6) Which of the following statements correctly explain the error in the orbital diagram shown above. a) Both arrows in the filled 2p orbital should be pointing in the same direction. b) There should be one arrow in the first 2p orbital and the second arrow should occupied another 2p orbital c) here is nothing wrong with this diagram d) All arrows should be pointing in the same direction 7) Select the electronic configuration that violated the Pauli exclusion principle. a) A b) B c) C d) D 8) Identify the rule that is being violated a) Aufbau's principle b) Pauli Exclusion principle c) Hund's rule d) Heisenberg uncertainty principle 9) Which is the correct molecular structure for carbon dioxide a) b) c) d) 10) How many total valence electrons are participating in bonding in the molecule? a) 8 b) 2 c) 4 d) 3 11) Which of the following is the correct Lewis dot structure for the molecule fluorine (F2) a) A b) B c) C d) D 12) CCl4 has how many double bonds? a) 0 b) 2 c) 1 d) 3 13) Which of the following elements are an exception to the octet rule and require less than 8 valence electrons? a) H b) Li c) Be d) B e) C f) Al 14) Hydrogen needs _____ electrons in its valence shell to be stable. a) 4 b) 6 c) 8 d) 2 15) Which of the following is the correct Lewis structure for water? a) A b) B c) C 16) Which of the following is the correct Lewis structure for the compound PBr3? a) structure A b) structure B c) structure C d) structure D 17) Which of the following elements are an exception to the octet rule and can hold more than 8 valence electrons? a) O b) P c) S d) H e) Xe

Electronic Configuration and Lewis Structure

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