We are asked to rank these elements according to electron affinity.
Ne Br Al
Recall that electron affinity is the energy change from the addition of 1 e– to a gaseous element/ion.
It is represented by this chemical equation:
Atom(g) + e– → Ion–(g), ΔE = –E.A.
The trend for electron affinity is as follows: it increases from left to right and decreases down a period in the periodic table. The given elements are:
Note: Nobel gases are not included in the trend and will have the lowest electron affinity.
Rank these elements according to electron affinity.
Ne Br Al
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Periodic Trend: Electron Affinity concept. You can view video lessons to learn Periodic Trend: Electron Affinity. Or if you need more Periodic Trend: Electron Affinity practice, you can also practice Periodic Trend: Electron Affinity practice problems.
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Based on our data, we think this problem is relevant for Professor Pomeroy's class at UCSD.