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Rank the following elements by electron affinity, from most positive to most negative EA value. Rank from most positive to most negative. To rank Items as equivalent, overlap them.
View Available Hint(s) Reset Help Krypton (phonmahora) Erodium) Couten bromine) Most positive Most negative the correct ranking cannot be determined.
Answer “Rank the following elements by electron affinity, from most positive to most negative EA value.”
Concepts and reason
The problem is based on the concept of electron affinity (EA) of an atom. It is the energy required or released to add an electron to an atom. It is the measure of the attraction between negative charge of electron and positive charge of nucleus. The factors affecting the values of electron affinities are nuclear charge, distance and screening. The stronger the attraction between the incoming electron and nucleus, the more energy is released.
The tendency of electron affinities to be more negative when moving through a period than they are when moving down a group is apparent.
There are exceptions to this general trend in electron affinity. Noble gasses (group 18), have the highest positive EA values, while halogens (17) have the lowest. Group 2 alkaline earth metals have positive EA values, while group 15 elements have lower negative values than groups 14 and 16.
Krypton is zero group element.
Bromine has highest EA
Order is Krypton (Kr) Sodium (Na) Phosphorus (P) Tellurium (Te) Bromine (Br)
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