Why the second value of electron affinity of an element is usually shown with a positive sign
Answers
First, the symbol for joule is ‘J’. Second, if you are using symbols, you use the symbol for mole and that is ‘mol’
So, 100 kilojoules per mole or 100 kJ/mol
The first electron affinity involves adding an electron to an oxygen atom which is neutral. You get an O^- ion.
The second electron affinity involves adding an electron to an O^- ion. You are adding an electron to something that is negatively charged. It takes energy to do that.
This is because the electron is being added to an already negatively charged ion. Thus, it requires energy to overcome the repulsion.
What is the element with high electron affinity:
Answer Electron affinity is the energy released when we add an electron to the outermost orbit of the atom. Halogens are the higher in electron affinity, and chlorine has the higher electron affinity than rest of the halogens. The irregularity in the electron affinity trend between Cl and F is d… (MORE)
What is electron affinity:
The energy change that occurs when an electron is added to a neutral atom. This is usually exothermic. Noble Gases are excluded from this. Equation: X(element)+e-(electron)---------> X -1 + energy
Which element has the lowest electron affinity Is it nitrogen?
No, nitrogen does not have a low electron affinity. Electron affinity increases as you go up and to the right on the periodic table. Thus, Groups I and II elements (ex. Cs, Ba, Sr, etc.) have LOW electron affinities and the halogens in Group VII (Br, Cl, F, etc) have the HIGHEST electron affinities.… (MORE)
Answer:
it is not shown with +ve sign. Instead it is shown with a -ve sign
Explanation: