Which answer has the elements arranged in order from most negative to least negative electron affinity?

Question

BlackTom AI · Accepted Answer

To determine the correct order, we must compare the electron affinities (EA) of the elements in question and arrange them from most negative (largest exothermic EA) to least negative (smallest exothermic EA).

Option a: Se, Br, As. Selenium has a less negative EA than bromine, meaning less exothermic. Putting Se before Br would not reflect a monotonic decrease in negativity, so this order is incorrect.

Option b: Br, Se, As. Bromine has the most negative EA among the three, followed by selenium, then arsenic. This matches the trend that EA becomes more negative moving to the right within a period and decreases down a group. Here, the sequence Br (most negative) → Se → As (least negative) is consistent.

Option c: As, Br, Se. This starts with the least negative EA (As) and then moves to more negative values (Br and Se), which is the wrong direction for a decreasing EA sequence.

Option d: Br, As, Se. This places arsenic (less negative EA) before selenium (more negative than As), which breaks the expected decreasing order Br > Se > As.

Option e: As, Se, Br. This begins with the least negative EA and ends with the most negative, which is the opposite of the requested order.

Option f: Se, As, Br. Here selenium’s EA is more negative than arsenic, so the sequence goes more negative → less negative correctly from Se to As, but then to Br (which is more negative than Se), this ordering does not consistently decrease across all three steps, making it incorrect as a strict most-to-least negative progression.

Overall, only option b provides a strictly decreasing (most negative to least negative) sequence Br → Se → As, which aligns with the known EA trends across these elements.

CHM1051 MUM S2 2025 CHM1051 Practice Exam 2

Which answer has the elements arranged in order from most negative to least negative electron affinity?

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