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13. Which of the following is the electron configuration for the valence shell of oxygen? A. 11 11 D. 1 1 1 2s 2p 2s 2p B. 1 1 1 1 E. 11 11 1 1 2s 2p 2s 2p C. 1 1 1 14 2s 2p 14. Which of the following is the electron configuration for the valence shell of nitrogen? A. 1 1 1 D. 11T 2s 2p 2s 2p B. 1 1 1 1 E. 1 1 1 1 2s 2p 2s 2p C. 2s 2p 15. Which of the following is the electron configuration for magnesium ion? A. 1923-2p D. 1s 2s 2p 33 B. 1s 2s 2p 3s E. 1s2s2p c. 1s 2s 2p 3s Thinking/Inquiry: 8 marks 16. Which atom or ion has the same electron configuration as Air? A. Cal B. K C. S D. E. CI 17. Which of the following is the electron configuration for neon? A. 122p3s D. 1s 2s 2p B. 1s 2s 2p 3s1 E. 1s 2s 2p c. 1s 2s 2p 18. Which of the following is the electron configuration for sodium ion? A. 122p3s D. 1s 2s 2p 3s B. 1.22p3 E. 1522 c. 122p 33