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.
Why is fluorine an exception to electron affinity?
Electron affinity of fluorine is less than that of chlorine. … Due to the smaller size and thus, the greater electron-electron repulsions,
fluorine will not accept an incoming electron with the same as chlorine
.
Why do some elements not have electron affinity?
When an electron is added to a metal element, energy is needed to gain that electron (endothermic reaction). … It is easier to lose their valence electrons because metals’ nuclei do not have a
strong
pull on their valence electrons. Thus, metals are known to have lower electron affinities.
What family of elements do not have an electron affinity?
Explanation: Neon, for example, has its outer shell full, because it’s a noble gas. It has already satisfied its filling of electrons, so it doesn’t want anymore (or any less). This is true of all
noble gases
.
Why is Group 15 an exception to electron affinity?
Re: Electron Affinity Exception
It appears that when atoms in group 15 have a much larger number of protons and electrons (are at much higher energy levels)
it becomes more favorable for them to gain another electron in one of the p orbitals
, instead of electron repulsion discouraging it from entering.
What group has the highest electron affinity?
Chlorine
has the highest electron affinity among the elements. Its high electron affinity can be attributed to its large atomic radius, or size. Because chlorine’s outermost orbital is 3p, its electrons have a large amount of space to share with an incoming electron.
Which has the most negative electron affinity?
Although the number of protons decreases too, it will not have much effect. So we can conclude that the top member in the Halogens group will have the most negative electron affinity. That element is
Florine
.
Why does Chlorine have highest electron affinity?
Due to the availability of this space the electrons
in this orbital easily
share this space with an extra electron. Therefore, chlorine has a higher electron affinity than fluorine, and this orbital structure causes it to have the highest electron affinity of all of the elements.
What do you mean by electron affinity?
1 :
the degree to which an atom or molecule attracts additional electrons
. 2 : the minimum energy required to remove an electron from a negative ion to produce a neutral atom or molecule.
Which element has highest electron affinity among halogens?
Hence electron affinity of
Chlorine
is higher in halogens.
Which element has the highest most positive electron affinity?
Therefore,
chlorine
has a higher electron affinity than fluorine, and this orbital structure causes it to have the highest electron affinity of all of the elements.
How do you know which element has the highest electron affinity?
Electron Affinity Trends
Therefore, elements with the highest electron affinity in
the top right corner of the periodic table
.
Why does Group 2 have low electron affinity?
Notice that the Group 2 elements have much lower electron affinities than the Group 1 elements, with beryllium and magnesium even having positive electron affinities. … This is because
the addition of an electron to nitrogen’s neutral configuration, for
example, creates the first paired electrons in the p orbital.
How do you determine negative electron affinity?
In general, elements with the most negative electron affinities (the highest affinity for an added electron) are those with
the smallest size and highest ionization energies
and are located in the upper right corner of the periodic table.
Which element has the most exothermic electron affinity?
The trend for electron affinity is as follows: it increases from left to right and decreases down a period in the periodic table. The element that has the most exothermic electron affinity is c) Cl.
Which of the following has highest first electron affinity?
Chlorine
has the highest first electron affinity.
