10. Periodic Properties of the Elements

Which of the following is the correct electron configuration for the Ca^{2+} ion?

Which of the following represents the electron configuration of S^{2-}?

Which of the following is the correct electron configuration for the fluoride ion (F⁻)?

Which of the following is the correct electron configuration for the Mg^{2+} ion?

How many total electrons are present in a Ni^{2+} ion?

How many d electrons are present in a ground-state Mn atom?