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

To rank the elements by electron affinity from most positive to most negative, we need to consider their tendencies to gain an electron. The higher the electron affinity value, the more likely an element is to attract an electron. Here is the ranking:

1. Iodine (I)
2. Oxygen (O)
3. Phosphorus (P)
4. Argon (Ar)
5. Sodium (Na)

Iodine (I) has the highest electron affinity value, meaning it has the greatest tendency to attract an electron. Oxygen (O) has a slightly lower electron affinity compared to iodine. Phosphorus (P) comes next, followed by argon (Ar). Sodium (Na) has the lowest electron affinity value among the given elements.

To rank the elements by electron affinity, we need to understand what electron affinity is. Electron affinity refers to the energy change that occurs when an atom gains an electron. Atoms with higher electron affinity tend to have a stronger attraction for electrons.

To find the electron affinity values for each element, we can refer to a periodic table or use reliable scientific sources. Here are the electron affinity values for the given elements:

Argon (Ar): -96 kJ/mol
Sodium (Na): -53 kJ/mol
Iodine (I): -295 kJ/mol
Oxygen (O): -141 kJ/mol
Phosphorus (P): -74 kJ/mol

Now, let's rank the elements from most positive to most negative electron affinity:

1. Sodium (Na): -53 kJ/mol
2. Phosphorus (P): -74 kJ/mol
3. Oxygen (O): -141 kJ/mol
4. Argon (Ar): -96 kJ/mol
5. Iodine (I): -295 kJ/mol

In this ranking, sodium has the most positive electron affinity value, indicating its relatively weaker attraction for an additional electron. On the other hand, iodine has the most negative electron affinity value, indicating its strong attraction for electrons.

Electron affinity is the ability or likelihood of an atom to attract an electron to itself.

Sodium>>>>Oxygen>>>Phosphorous>>Iodine>Argon
Electron affinity is indirectly proportional to # of valence e-

You can look these up on www.webelements.com