The amount of energy released when an electron is added to a species in the gaseous phase to form a negative ion.

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Electronegativity and anion stability

If two similar sized atoms have different electronegativity values, the atom with higher electronegativity holds the electrons more tightly, and thus is more stable. Example: hydroxide vs azanide ...
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2nd Electron Affinity of halogens

I have seen questions regarding EA but they were all about the 1st EA so this question is not duplicate. I came across a statement which goes like "2nd EA of halogens is almost zero". How is this ...
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Using electron affinity to calculate lattice energy

I am trying to calculate the lattice energy of $\ce{CaBr2}$, I am uncertain of how to incorporate the electron affinity value provided for $\ce{Br2}$ into my calculation. Since electron affinity is ...
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42 views

For group 7 elements, are anions a lower energy state than being neutral atoms?

Given that electron affinity is positive, why don't these atoms attract free electrons and "prefer" to exist as anions? Never made sense to me — I could be missing something obvious.
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Electron affinity of Group 15 elements

The electron affinities of elements in the same group should decrease as you go down the group, but in the Group 15 elements the values generally increase: $$\begin{array}{cc} \hline \text{Element} ...
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77 views

Can we add an electron to an atom?

Say that we have an atom which is inert, or stable. How would one go about adding one electron. Is it possible?
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114 views

Ionization energy and Electron Affnity

Which of the following statements correctly interprets the relationship between ionization energy, atomic radius Electron affinity when comparing two atoms. The correct choice as per my instructor ...
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Which element has a greater second electron affinity, sulfur or oxygen?

I found a question asking the above which states that sulfur has a lesser second electron affinity than oxygen. But since the inter-electronic repulsion in sulfur is lesser, shouldn't it be willing to ...
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279 views

Electron affinities of the chalcogens and halogens

Here are the electron affinities of the 17th and 18th groups. The general trend for electron affinity down the group is that it decreases because of the increase in atomic radius.The exception of ...
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Why is electron gain generally exothermic?

1) I understand that we need to supply energy to counter the nuclear attraction when we remove electrons and that is the reason ionization energy is endothermic. However, why does an atom release ...
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339 views

is it possible to break the bonds of diatomic elements such as fluorine or iodine and create positive and negative ions by electron bombardment?

If I had a container in vacuum filled with $\ce{I2}$ gas and then I bombarded it with high speed electrons using an electron gun, would be able to get both $\ce{I+}$ and $\ce{I-}$ ions or would I ...
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100 views

How do I predict the spontaneity of a metathesis reaction?

How do I predict the spontaneity of a metathesis reaction? Is it a matter of summing up the differences between their ions' standard reduction potentials? Take the salt metathesis reaction between ...
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1answer
107 views

While electrolyzing concentrated aqueous sodium chloride, why is it that chlorine is discharged but not sodium?

Hydrogen and hydroxide both exceed sodium and chlorine in terms of reduction and oxidation potential respectively. While electrolyzing a concentrated solution of aqueous NaCl, it is known that ...
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electron affinity and electron gain enthalpy

Can anyone help me to clarify the difference between electron affinity and electron gain enthalpy? For example- Why is second electron affinity of oxygen greater than that of sulphur? I think it ...
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181 views

Ca energy release when gaining an electron

Why does Ca have a negative electron affinity, i.e. energy is released when it gets an electron (ca. -2 kJ/mol), when Be and Mg have positive values? I know that the electron will be settled in the 3d ...
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2answers
438 views

Why does K have a greater electron affinity than Ca?

Why will $\ce{K}$ have a greater electron affinity than $\ce{Ca}$? I know that $\ce{Ca}$ has a greater first ionization energy, and I also know that $\ce{K}$ has a greater second ionization energy, ...
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1answer
7k views

Which atom goes in the middle of a lewis dot structure?

I've read online in multiple sites that the least electronegative atom goes in the middle with the exception of H, which always goes on the outside. However, in the molecule NaCN, C is in the middle. ...
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Relativistic effect: d-electrons in metallorganic complexes

With higher period the d-electrons of the metal are less strong bonded and therefore oxidative addition is easier for $\ce{Ir(I)}$ than for $\ce{Rh(I)}$ and much easier than for $\ce{Co(I)}$. For ...
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1answer
156 views

Is there a relation between the ionization energy and the electron affinity?

I am aware of the definition and equation of IE and EA. I was wondering if there is a direct relation between this two quantities with the energy of the neutral specie.
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Why fluorine doesn't act as the central atom in inter-halogen compounds?

Why can't fluorine be the central atom in inter-halogen compounds? A $\ce{F-F}$ bond is weaker than a $\ce{F-X}$ bond and thus, fluorine should be happy to form inter-halogen compounds. But, why ...
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183 views

Electron Affinity trends

Imagine an arrangement of atomic orbitals in an alternate universe, in which the s subshell contains 2 orbitals instead of 1, and the p subshell contains 4 orbitals rather than 3. In which groups ...
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34k views

Why does chlorine have a higher electron affinity than fluorine?

Since fluorine has its valence electrons in the n=2 energy level, and since chlorine has its valence electrons in the n=3 energy level, one would initially expect that an electron rushing towards ...
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152 views

Why does oxygen not like to be doubly anionized?

The electron affinity of a neutral oxygen atom is −142 kJ (it releases this energy). The electron affinity for the now anionized oxygen is 710 kJ (work must be done on the atom). My question is, why ...
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446 views

Electronegativity

Why is the Electronegativity difference for atoms in bonding uncertain while determining what the compound will be? According to the IB(International Baccalaureate) they say that the ...
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2k views

List in order of increasing radius

List in order of increasing radius: a) Rb, K, C5, Kr For this one I got C, Kr, K, Rb b) Ar, Cs, Si, Al This I got: Ar, Si, Al, Cs Does anyone know if this is correct? I don't have the solution ...
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758 views

What determines the electronegativity of an element?

Is it possible to work out without post-Bohrian mathematics?
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Why does cesium have a positive electron affinity?

When an electron is added to cesium, why is energy released?
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Are there any major exceptions when comparing electron affinity?

I was tasked with figuring out whether carbon or nitrogen has a more negative electron affinity value. I initially picked nitrogen, just because nitrogen has a higher $Z_\mathrm{eff}$, creating a ...