Identifying the electron added or removed to form an lon For each atom in the table below, write down the subshell from which an electron would have to be removed to make a +1 cation, and the subshell to which an electron would have to be added to make a -1 anion. The first row has been completed for you. atom subshell from which electron removed to form +1 cation subshell to which electron added to form -1 anion H Ca Rb Se ☐ Is x 18 0 0 ?