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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.
argon,sodium,iodine,oxygen,phosphorus

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PBCHEM
Following is the trend of electron affinity, from most positive to most negative EA value:
                           Iodine > Oxygen > Phosphorous > Argon > Sodium

Herein, iodine have maximum electron affinity, while sodium has minimum electron affinity. In general electron affinity value increases as we move from left to right in periodic table. 
ardni313

Rank by electron affinity, from most positive to most negative : Argon - sodium-phosphorus-oxygen-iodine

Further explanation

Electron affinity indicates the energy released if an atom attracts electrons. The greater the energy released (negative value), the greater the tendency of the atom to attract electrons and become negative ions

In one group, electron affinity tends to decrease from top to bottom, whereas in one period, from left to right, affinity tends to increase

From the above statement, it can be concluded that the largest electron affinity (the most negative) is owned by the elements located on the upper right in the period system

Let see the position of elements in the periodic system

  • argon

group VIIIA, noble gas

  • sodium

group 1A, alkali

  • iodine

VIIA group, halogen

  • oxygen

VIA group

  • phosphorus

VA group

Then the location of the elements above from left to right according to the group are: sodium, phosphorus, oxygen, iodine and argon

Except for the alkaline (IIA) and noble gases(VIIIA), all major group elements have a negative electron affinity, with the halogen element having the greatest electron affinity

So the order from most positive to most negative:

Argon - sodium-phosphorus-oxygen-iodine

Existing data for afinity electrons from the elements above(kj/mole) :

Ar=Argon = 35

Na = sodium = -52.2

P = phosphorus = -72.4

O = Oxygen = -142.5

I = iodine = -298.4

Learn more

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Keywords: electron affinity, periodic system, atomic radius, metal, nonmetal

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