What is electron affinity video?
Electron affinity is the energy change that results from adding an electron to a gaseous atom. Because this value is negative (energy is released), we say that the electron affinity of fluorine is favorable.
What is electron affinity trend?
What is the trend for electron affinity? Electron affinity increases upward across periods of a periodic table for the groups and from left to right, because the electrons added to the energy levels get closer to the nucleus, making the nucleus and its electrons more attractive.
Is there an electron affinity trend?
The electron affinity of an atom or molecule is the propensity for that particle to gain an electron. There are general trends in electron affinity across and down the periodic table of elements. Electron affinity generally increases across a period in the periodic table and sometimes decreases down a group.
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.
How do you explain electron affinity?
Electron affinity is defined as the change in energy (in kJ/mole) of a neutral atom (in the gaseous phase) when an electron is added to the atom to form a negative ion. In other words, the neutral atom’s likelihood of gaining an electron.
What element has the smallest electron affinity?
mercury
Of the metals, mercury has the lowest electron affinity.
What causes electron affinity?
The electron affinity is a measure of the attraction between the incoming electron and the nucleus – the stronger the attraction, the more energy is released. The factors which affect this attraction are exactly the same as those relating to ionization energies – nuclear charge, distance and screening .
Which period has the highest electron affinity?
Hence, Cl has the highest electron affinity. So, option (b)- Period 3, group 17 is the correct answer.
Which is an example of an electron affinity?
Closes this module. Electron affinity is the energy change that results from adding an electron to a gaseous atom. For example, when a fluorine atom in the gaseous state gains an electron to form F⁻ (g), the associated energy change is -328 kJ/mol.
Is there a periodic value for electron affinity?
Unlike electronegativity, the electron affinity does not have a strong periodic value. The electron affinity measures the energy released when an electron is captured by the atom (or a molecule), forming an anion with a 1− charge.
Do you have to have a negative electron affinity?
Electron affinities don’t have to be negative. For some atoms, there’s actually no attraction for an extra electron. Let’s take neon, for example. Neon has an electron configuration of one s two, two s two, and two p six. So there’s a total of two plus two plus six, or 10 electrons, and a positive 10 charge in the nucleus for a neutral neon atom.
Why are the second electron affinities of all elements positive?
The second electron affinities of all elements are positive. This is because the negative ion is a negative electric field. And if now the other electrons enter the negative field, energy has to be applied to the system to overcome the repulsion that the negative electric field interacts with the electrons.