1. Correct Answer: Both Statement I and Statement II are correct.
2. Explanation:
• Statement I is correct. • Rare earth elements are a group of 17 elements in the periodic table, which include the 15 lanthanides plus scandium and yttrium. • These elements are crucial in the manufacturing of various high-tech devices, including flat television screens and computer monitors. • They are used in the production of phosphors, which are essential for the display technology in these screens. • The demand for rare earth elements has increased with the advancement of technology and the proliferation of electronic devices.
• Statement II is correct. • Some rare earth elements, such as europium and terbium, have phosphorescent properties. • Phosphorescence is the property of emitting light after being energized, which is crucial for display technologies. • These elements are used in the production of phosphors that emit red and green light, respectively, which are essential for color displays. • The unique electronic configurations of rare earth elements allow them to exhibit these phosphorescent properties, making them valuable in various applications, including lighting and displays.
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