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The ′ f ′ orbitals are half and completely filled, respectively in lanthanide ions [Given: Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]

1. Eu 2+ and Tm 2+
2. Sm 2+ and Tm 3+
3. Tb 4+ and Yb 2+
4. Dy 3+ and Yb 3+ CAREER POINT CAREER POINT Ltd., CP Tower, IPIA, Road No.1, Kota (Raj.), Ph: 080-47250011 www.careerpoint.ac.in 15 JEE Main Online Paper

Correct answer: Tb 4+ and Yb 2+

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