I know that for calculating the environmental factor three parameters fractional covalence (fc), bond volume polarizability (αb) and presented charge (Q) are used. Please suggest me how to calculate these three parameters (fc, αb and Q)?
You may find your answer in this link: https://books.google.com.sa/books?id=vv7KBQAAQBAJ&pg=PA178&lpg=PA178&dq=equation+for+calculation+of+environmental+compound&source=bl&ots=OAJERAUkKU&sig=Cw7Rev12R61igUx8MyKxqY6Q4G0&hl=en&sa=X&ved=0ahUKEwi_o-6nqNjJAhUMBBoKHercBAcQ6AEIKzAD#v=onepage&q=equation%20for%20calculation%20of%20environmental%20compound&f=false