Which is the correct order of electron affinity?

Author

Christopher Ramos

Published Mar 06, 2026

Which is the correct order of electron affinity?

Therefore, the correct order of electron affinity is Cl > F > Br.

People also ask, why 1st electron affinity is negative and 2nd is positive?

1st Electron Affinity

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.

Additionally, which is the most electron affinity? chlorine

Keeping this in view, which has higher electron affinity O or 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 order of electron affinity of Group 17 elements?

Since the atomic size increases down the group, electron affinity generally decreases (At < I < Br < F < Cl). An electron will not be as attracted to the nucleus, resulting in a low electron affinity. However, fluorine has a lower electron affinity than chlorine.

What are the exceptions to electron affinity?

In general, exceptions arise when new subshells are being filled/half-filled, or in cases where the atom is too small. In the first case, Be and Mg are interesting examples: they have a positive electron affinity (just like N, in fact) because of the energy difference between the s and p subshells.

Is electron affinity negative or positive?

Unlike ionization energies, which are always positive for a neutral atom because energy is required to remove an electron, electron affinities can be negative (energy is released when an electron is added), positive (energy must be added to the system to produce an anion), or zero (the process is energetically neutral)

What is a negative electron affinity?

Electron Affinity is the energy associated with the addition of an electon to a gaseous atom. A more negative electron affinity corresponds to a greater attraction for an electron. (An unbound electron has an energy of zero.)

Why the second electron affinity of oxygen is negative?

You are forcing an electron into an already negative ion. It's not going to go in willingly! 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.

What is the lowest electron affinity?

mercury

Is the trend in electron affinities repetitive for periods 2 and 3?

b)Is the trend in electron affinities repetitive for Periods 2 and 3? Cite examples. Yes, it is, for example: the last element of both periods has the lowest electron affinities and their second last elements have the highest electron affinities.

Why is gaining an electron exothermic?

When an electron is added to an atom, the energy change is exothermic because of the attraction of the electron to the nucleus. However, in the case of EA₂ where the electron is added to an anion, the repulsion between the anion and this newly added electron will overwhelm the attraction of the electron to the nucleus.

Why energy is released in electron affinity?

When electrons are added to an atom, the increased negative charge puts stress on the electrons already there, causing energy to be released. When electrons are removed from an atom, that process requires energy to pull the electron away from the nucleus. Addition of an electron releases energy from the process.

Which one N or O has more electron affinity and why?

Answer. Answer: Oxygen has more electron affinity because Nitrogen gains more stability by attaining partial configuration.

Which one will be the correct order of electron affinity of halogens?

Therefore, the correct order of electron affinity is Cl > F > Br.

What is the most active element in Group 17?

FLUORINE

What is the order of electron affinity of halogens?

Electron affinity increases in a period and decreases in a group. But, fluorine atom, due to its small size cannot release high amount of energy. Hence, among halogens, chlorine atom has high value of electron affinity and the order is Cl>F>Br>I.

What is the other name for group 18th elements?

noble gases

Why do boiling points increase down Group 7?

The melting points and boiling points of the halogens increase going down group 7. This is because, going down group 7: the molecules become larger. the intermolecular forces become stronger.

Which has more electron affinity fluorine or bromine?

The electron affinity of an atom is defined as the amount of energy released or spent when an electron is added to a neutral atom or molecule in the gaseous state to form a negative ion in chemistry. From this we can observe that the electron affinity of bromine is a bit lower than fluorine.

What are bridge elements?

Bridge elements are elements that belong to period 2 of the periodic table. Bridge elements show a cross or a diagonal relationship with the 3rd-period elements in the periodic table.

What do group 17 elements form?

Halogens (group 17 elements) react with most metals to form an ionic metal halide, and the reactions are more vigorous with fluorine and least vigorous with iodine. The halogens also react with water. Ofcourse the reaction with fluorine is vigorous, while the reaction with other halogens is much less so

Why boiling point decreases down the group?

Both the melting and boiling points decrease down the group. The decrease in melting and boiling points reflects the decrease in the strength of each metallic bond. The atoms in a metal are held together by the attraction of the nuclei to electrons which are delocalized over the whole metal mass.

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