Multiple Choice
In the periodic table, a horizontal row is called a(n):
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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)
Verified step by step guidance1
Understand that Group 17 elements in the periodic table are called halogens, which include Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and others.
Recall that reactivity in halogens generally depends on their ability to gain an electron, which is influenced by atomic size and effective nuclear charge.
Recognize that as you move up the group from Iodine to Fluorine, the atomic radius decreases, making it easier for the atom to attract an electron due to stronger nuclear attraction.
Conclude that Fluorine, being at the top of Group 17, has the smallest atomic radius and the highest electronegativity, making it the most reactive halogen.
Therefore, among the options given (Chlorine, Bromine, Iodine), Fluorine is the most reactive halogen because of its position in the periodic table and its atomic properties.
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