Question

Why chlorine has high electroaffinity than flourine​

Answer 1

Fluorine has seven electrons in 2p-subshell whereas chlorine has seven electrons in its 3p-subshell. 3p-subshell is relatively larger than 2p-subshell. Therefore, repulsion among the electrons will be more in the 2p-shell of fluorine than 3p-subshell in chlorine. Due to the smaller size and thus, the greater electron-electron repulsions, fluorine will not accept an incoming electron with the same as chlorine.

Answer 2

Hope it'll clear your doubt

Step-by-step explanation:

example

like in Po4³- one coordinate bond formation occurs coz Phosphorus has valency of 3 and can form 3 bonds when extra electrons on Oxygen atom forms bonds with Phosphorus....those 3 bonds are covalent but.....phosphorus has 5 valence electrons in valence shell so it has already formed 3 bond with Oxygen atoms....now remaining two electrons of P forms coordinate bond with Oxygen