How do you determine electron affinity?

Answer 1

Measure the equilibrium constant for the reaction of thermal electrons with a species at different temperatures. this has been done with an electron capture detector. another way to measure it is to make a negative ion and shine light on it and measure the energy of the electrons removed by this process Dr.Edward Chen

Answer 2

they should giveyou a chart to read off....

if they don't, then the first is small, and then it increases as you take more electrons... because the atomic radius is decreasing, the nuclear pull is increasing, and the ratio of protons to electrons is increasing, so the electrons are pulled in more tightly

Answer 3

Factors affecting the value of electron affinity

(i) Atomic size: The value of electron affinity decreases with the increase in the size of atom since the nuclear attraction decreases down a group as the atomic number increases. Its value increases as we move along a period since the size of atoms decreases along a period. The lower value of Fthan Cl is due to the very small size of F in which negative charge is highly concentrated and repels the incoming electron thereby reducing the force of attraction of the nucleus towards the adding electron and hence decreasing the electron affinity. Thus, chlorine has a highest value of electron affinity.

(ii) Nuclear charge: The value of electron affinity increases with increasing nuclear charge. Thus, its value increases with increase in nuclear charge along a period.

(iii) Screening or shielding effect: The value of electron affinity increases with the decrease in shielding effect of inner electrons. Besides, the value of electron affinity also depends to some extent upon the type of orbital in which electron is added. The value is greater when electron enters 's' orbital and decreases successively for p, d and f orbitals.

Answer 4

Electron affinity is the change in energy when a new electron is added to the atom making it a negative ion.

All the metals (elements on the left side) wants to loose electrons to be in the noble gas notation but electron affinity is adding an electron, so it would require lots of energy to add electron(s). Because it requires energy to add electrons, the answer would be negative.

All the non-metals, on the other hand, tends to accept electron(s) to achieve the noble gas notation. When electron(s) is/are added to the atom, they would release energy, so the answer would be positive.

Answer 5

size