Final answer:
The d-block of the periodic table contains elements with partially filled sublevels, such as Chromium with electron configuration [Ar] 3d⁵ 4s¹.
Explanation:
Elements with partially filled / sublevel can be found in the d-block section of the periodic table where transition metals are located. For example, Chromium (Cr) has the electron configuration: [Ar] 3d⁵ 4s¹, which shows the partially filled 3d sublevel.
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