The unit of electron affinity is electron volts per atom or kilojoule per mole. Electron Affinity of Chemical Elements. As elements of group 15 are half filled so, they are more stable in nature and have slightly less electron affinity as compared to group 14 elements. is the electron affinity. Group VIIA elements, the halogens, have high electron affinities because the addition of an electron to an atom results in … Chemistry chapter review 82 Terms. b. electron affinity, electronegativity, ionization energy, atomic radius, and ionic radius. An atom having such an electronic structure tends to form a stable shell of eight electrons by adding two more, producing an ion that has a double negative charge.

The electronic affinity is amount of energy, that is released during the attachment of the electron to the neutral atom. The chalcogens (/ ˈ k æ l k ə dʒ ɪ n z /) are the chemical elements in group 16 of the periodic table.This group is also known as the oxygen family.It consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and the radioactive element polonium (Po). No idea why. These elements are relatively stable because they have filled s subshells. The exceptions found among the elements of group 2 (2A), group 15 (5A), and group 18 (8A) can be understood based on the electronic structure of these groups. Data taken from John Emsley, The Elements, 3rd edition.Oxford: Clarendon Press, 1998. As a result of such attachment, a negative ion (anion) is formed. The chemically uncharacterized synthetic element livermorium (Lv) is predicted to be a chalcogen as well.

Thus, we can conclude that the trends and exceptions to the trends in electron affinity … Electron affinity is the attraction a neutral atom has for a non-bonding electron. It is represented by a negative sign [-] for example, \(Cl ~(g) ~+ ~e^- \rightarrow Cl^-~ (g)~ +~ 349~ KJ/mol\) Therefore, the electron affinity of … 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. What trends can be observed across the various periods within the main group elements? The important physical properties of the elements of group 16 are recorded as shown below: Some physical properties of the elements of group 16. Oxygen group element - Oxygen group element - Comparison of properties: The elements belonging to Group 16 of the periodic table are characterized by electron configurations in which six electrons occupy the outermost shell. Therefore, electron affinity will also increase on moving from left to right.

The Group IIA elements, the alkaline earths, have low electron affinity values. Electron Affinities reported in unites of kilojoules per mole (kJ/mol). As an unexpected outlier, also Mn.