I was out sick & am copying a friends notes from class. My question is what does e- stand for?

Question

it easier to form a positive ion with a low ionization energy because a positive ion is formed by removing an e-(I think maybe electron)

and the other one is e-s?
The trend in ionization as you go down decreases because the shielding effect makes it easier to remove outer e-s from atoms with more e-s ( I think maybe electron shield) Thanks in advance

Answer 1

e- simpley stands for electron,
and e-s for electrons (plural)

Answer 2

Thank you!