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A monatomic ion with a 1- charge has the electron configuration 1s22s22p63s23p64s23d104p6

(a) What neutral noble-gas atom has the same electron configuration?

(b) What is the monatomic ion with a 1- charge that has this configuration?

(c) Write the symbol of an ion with a 2+ charge that is isoelectronic with the species in (a) and (b).

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