Why does O have more electron affinity than O?

It seems at first that O− should have a greater electron affinity since it is closer to an octet. Actually, since O− is negatively-charged, it would be more difficult to accept an electron, and significant coulombic repulsion would make the electron affinity of O− more positive than that of O (which is negative).

What is the electron affinity of oxygen equal to?

Oxygen – Properties

Which has the highest electron affinity O or O?

The size of O− is small. Thus, O− experiences greater repulsion. Thus, O− has the highest electron affinity. Thus, the species having the highest electron affinity is O−.

Why is the second electron affinity ea2 of oxygen much more positive than the second electron affinity ea2 of sulfur?

The positive sign shows that you have to put in energy to perform this change. The second electron affinity of oxygen is particularly high because the electron is being forced into a small, very electron-dense space.

Why is O+ more electronegative than O?

Why is O+ more electronegative than O? Whereas, in Oxygen without charge there are equal protons and neutrons so the stability already there, thus the electronegativity of Oxygen with positive charge is more than neutral charge.

Why is second electron affinity endothermic?

2nd electron affinity is always endothermic (positive) because the electron is added to an ion which is already negative therefore it must overcome the repulsion.

What is second electron affinity of oxygen?

$ The required second electron affinity of oxygen is $744.4kJ/mol$.

Why is the second electron affinity of oxygen endothermic?

When we want to add one more electron to oxygen after addition of one electron then the second electron will face repulsion from other electrons in the valence shell of oxygen. Therefore, we can say that addition of a second electron to oxygen is an endothermic reaction.

Why is ea2 always positive?

There is energy released in bringing in the negative electron up to the positive nucleus. Because the electron is negatively charged you can see that there will be repulsion between the ion and the electron making the process endothermic, hence the positive value.

Why is 2nd electron affinity endothermic?

Is O+ more electronegative than O?

You know that O+ and N+ are more electronegative than their neutral atoms, and that O is more electronegative than N.

What does a more positive electron affinity mean?

Lesson Summary The electron affinity is the energy change when an atom gains electrons. The convention is that the higher or more positive the electron affinity value, the more readily the atom accepts an electron.

What is the electron affinity of an oxygen atom?

Electron affinity of Oxygen is 141 kJ/mol. In chemistry and atomic physics, the electron affinity of an atom or molecule is defined as: the change in energy (in kJ/mole) of a neutral atom or molecule (in the gaseous phase) when an electron is added to the atom to form a negative ion .

Why is the second electron affinity always higher?

But in the case of addition of the second electron to an ion, more energy is required, because the Ionization potential of the second electron is higher. Thus the second electron affinity or the second Ionization energy is always higher than what was gained in the first place, the net energy being positive.

Why does noble gas have a positive electron affinity?

A noble gas configuration, being the most stable, releases energy (heat) to decrease the total energy of the configuration. Release of energy corresponds to a Positive Electron Affinity.

Which is more positive, O− or O−?

Actually, since O− is negatively -charged, it would be more difficult to accept an electron, and significant coulombic repulsion would make the electron affinity of O− more positive than that of O (which is negative). If electron affinity is favorable, energy is released upon adding an electron, meaning it’s negatively-signed.