electron affinity
By: Arth chester Vallarta
The electron affinity of the elements varies across the periodic table, though most trends are only loosely held.
· The electron affinity of an atom or molecule is the propensity for that particle to gain an electron.
· The electron affinity of an atom is defined as the amount of energy released when an electron is added to a neutral atom or molecule to form a negative ion.
Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus stronger attraction between the nucleus and its electron.
Electron affinity decreases down the groups and from right to left across the periods on the periodic table because the electrons are placed in higher energy level far from the nucleus, thus a decrease from its pull.
· The electron affinity of an atom or molecule is the propensity for that particle to gain an electron.
· The electron affinity of an atom is defined as the amount of energy released when an electron is added to a neutral atom or molecule to form a negative ion.
Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus stronger attraction between the nucleus and its electron.
Electron affinity decreases down the groups and from right to left across the periods on the periodic table because the electrons are placed in higher energy level far from the nucleus, thus a decrease from its pull.
Reference:
Chemistry Lectures
chem.tamu.edu/electron-affinity.htm
chemistry.about.com/od/electron-affinity.htm
Chemistry Lectures
chem.tamu.edu/electron-affinity.htm
chemistry.about.com/od/electron-affinity.htm