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Problem : What is the net charge on an ion of aluminum that is isoelectronic with neon? With magnesium?

+3, +1

Problem : Applying the Aufbau Principle, write the electronic configuration of the sulfide anion, which has a charge of negative 2.

The sulfide ion with a charge of negative 2 has the Argon Noble gas configuration:

Problem : Write the electronic configuration of atomic sulfur, keeping in mind Hund's rule.