Multiple Choice
Determine which atom in the following set has the largest electron affinity:N, O, C, B, Ne
a) N b) O c) C d) B e) Ne
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9. Electrons in Atoms and the Periodic Table
Periodic Trend: Electron Affinity (Simplified)
Multiple Choice
Based on the simplified periodic trend that electron affinity generally becomes more negative (greater) up Group 17, which element is the most reactive (most “active”) halogen?
A
Iodine (I)
B
Chlorine (Cl)
C
Fluorine (F)
D
Bromine (Br)
Verified step by step guidance1
Understand that the reactivity of halogens is related to their tendency to gain an electron, which is influenced by their electron affinity.
Recall that electron affinity generally becomes more negative (meaning the atom releases more energy when gaining an electron) as you move up Group 17 in the periodic table.
Recognize that a more negative electron affinity indicates a stronger attraction for electrons, which correlates with higher reactivity in halogens.
Identify the halogens listed: Iodine (I), Bromine (Br), Chlorine (Cl), and Fluorine (F), and note their positions in Group 17 from bottom to top: I < Br < Cl < F.
Conclude that since electron affinity becomes more negative up the group, Fluorine (F), being at the top, has the highest electron affinity and is therefore the most reactive halogen.
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