ap07_chemistry_form_b_sgs_final_complete

B identify element 3 explain your reasoning magnesium

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Unformatted text preview: Explain your reasoning. Element 2. It has the lowest first-ionization energy. Metallic elements lose electron(s) when they become ions, and element 2 requires the least amount of energy to remove an electron. One point is earned for the identification. One point is earned for the justification. (b) Identify element 3. Explain your reasoning. Magnesium. Element 3 has low first and second ionization energies relative to the third ionization energy, indicating that the element has two valence electrons, which is true for magnesium. (The third ionization of element 3 is dramatically higher, indicating the removal of an electron from a noble gas core.) One point is earned for the identification. One point is earned for the justification. (c) Write the complete electron configuration for an atom of element 3. 1s2 2s2 2p6 3s2 One point is earned for the correct electron configuration. (d) What is the expected oxidation state for the most common ion of element 2? 1+ One point is earned for the correct oxidation state. © 2007 The College Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for students and parents). AP® CHEMISTRY 2007 SCORING GUIDELINES (Form B) Question 6 (continued) (e) What is the chemical symbol for element 2? Na One point is earned for the correct symbol. (f) A neutral atom of which of the four elements has the smallest radius? Element 1 One point is earned for the correct identification of the element. © 2007 The College Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for students and parents)....
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This note was uploaded on 10/01/2009 for the course OC 9876 taught by Professor Dq during the Spring '09 term at UC Merced.

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