Multiple Choice
In the periodic table, a horizontal row is called a(n):
4. Atoms and Elements
Periodic Table: Group Names
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In the periodic table, Group 17 elements are the halogens. Which element is the most reactive (most active) halogen?
A
Chlorine (Cl)
B
Iodine (I)
C
Bromine (Br)
D
Fluorine (F)
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