Topic 2
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Describe how chlorine’s position in the periodic table is related to its electron arrangement.
Cl has 7 valence electrons and is in group 7; Accept “group 17” as suggested by IUPAC. Cl has 3 occupied (electron) shells/energy levels and so is in period 3;
What is the total number of valence electrons in C H 3 CO O − ? A. 16 B. 22 C. 23 D. 24
D
Which statements about the chlorine free radical are correct? I. It has 18 electrons. II. It is an uncharged species. III. It is formed by homolytic fission. A. I and II only B. I and III only C. II and III only D. I, II and III
C
Which are correct statements about the emission spectrum of hydrogen in the visible region? I. The red line has a lower energy than the blue line. II. The lines converge at longer wavelength. III. The frequency of the blue line is greater than the frequency of the red line. A. I and II only B. I and III only C. II and III only D. I, II and III
b