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AP Chemistry
1.5 Atomic Structure and Electron Configuration
AdvancedMCQConceptual22.7k
A schematic diagram of a magnetic deflection apparatus rendered in grayscale line art. On the left, a rectangular box is labeled 'Ion Source' from which a horizontal dashed line representing a beam of \(\text{Fe}^{2+}\) ions travels to the right. The beam passes through the gap between two magnetic pole pieces: an upper pole labeled '\(\text{N}\)' with a sharp wedge-shaped tip pointing downward, and a lower pole labeled '\(\text{S}\)' with a flat horizontal top surface, creating an inhomogeneous magnetic field. To the right of the magnet poles, a vertical rectangular plate is labeled 'Detector'. The dashed trajectory line continues horizontally through the magnet gap toward the detector. No other particles, labels, text, or annotations appear.
Apparatus used to measure the deflection of gaseous \(\text{Fe}^{2+}\) ions in an inhomogeneous magnetic field.
A beam of isolated gaseous iron(II) ions, \(\text{Fe}^{2+}\text{(g)}\), produced from neutral iron atoms (\(\text{Fe}\), atomic number \(26\)), is passed through an inhomogeneous magnetic field using the apparatus shown below to determine its magnetic behavior.

Which of the following correctly identifies the ground-state electron configuration of \(\text{Fe}^{2+}\text{(g)}\) and predicts its behavior in the magnetic field?

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