How could cl change to gain stability?
lose 7 electrons
gain one electron

Explanation:

if you look to electron configuration

[ Ne ] 3s2 3p5

so Cl need just one electron to reach octet rule ( 8 electron )

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

14

hungary

66.9%

82

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

10

ans is no, the data set cannot be plotted as a single circle graph

c. 4.54 x 10–12 j happens to be correct