1. A diatomic chemical element, number 17, which is a yellow-green gas and can form many compounds such as sodium choride.
2. The mixture of chlorine with various other chemicals that is added to pools.
Pointless stupid assessment test. A test on which the government of Pennsylvania requires all students to achieve a proficient score. Since some stupids are bad at standardized tests, they are placed in "academic skills" courses. The even put the scores on your college transcript.