Light has both a wave nature and a particle nature. Light behaves primarily as a particle when it
(a) travels from one location to another.
(b) interacts with matter.
(c) both
(d) neither
Which of these elements has chemical properties the most similar to those of chlorine (Cl, atomic number 17)?
(a) O
(b) Na
(c) S
(d) Ar
(e) Br
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