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The subshell to which an electron would have to be added to make a -1anion.Hg 4f 5d H 1s 1s X 5s 4p Ne 3s 2p K 4s 3p.The charge of an electron, which is commonly thought to be negative, is equal to and the opposite of the charge of a proton, which is typically thought to be positive. Because there are moreelectronsthan protons in an ion's total charge, the net charge is notzero. An anion is a negatively charged ion that has more electrons than protons compared to apositivelycharged ion called a cation. Because they have opposing electric charges, cations andanionsare drawn to one another by electrostatic force, which makes it easy to create ionic compounds. Atomic ions are distinct from molecular ions, which are composed of two or more atoms and are also known as multi-atom ions.To know more aboutanionplease refer:brainly.com/question/15578817#SPJ4...