Final answer:
The ground state free-ion term-symbol for V3+ ion is 2d3/2. Option c.
Step-by-step explanation:
The ground state free-ion term-symbol for V3+ ion is 2d3/2.
The electron configuration of Vanadium (V) is 1s²2s²2p⁶3s²3p⁶4s²3d³. When V loses 3 electrons to form V3+, it becomes 1s²2s²2p⁶3s²3p⁶3d⁰.
The term symbol for V3+ is determined by the last partially filled subshell, which in this case is the 3d subshell. The electron configuration of the 3d subshell is 3d³, and the term-symbol for this configuration is 2d3/2 option c.
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