Diamond Cubic Crystal 💎 + Body/Face Diagonal Formulas | Solid State Lecture 5 (Part-1) | VBU SEM-2 |

💎 *SOLID STATE CHEMISTRY – LECTURE 5 (PART 1)* Namaskar students! Welcome back to *Chemistry with Gautam* 🧪🎓 In this lecture, we will understand the structure of Diamond Cubic Crystal, the position of lattice points, coordinate systems of different cubic unit cells, and the important mathematical relationships between body diagonal, face diagonal and edge length. The concepts are explained step by step with diagrams to make Solid State Chemistry easier to understand. 📚 *TOPICS COVERED IN THIS LECTURE* ✅ Diamond Cubic Crystal Structure ✅ Position of Lattice Points in Diamond Cubic Crystal ✅ Coordinate System of Simple Cubic (SC), Body-Centred Cubic (BCC) and Face-Centred Cubic (FCC) Unit Cells ✅ Fractional Coordinates of Lattice Points ✅ Body Diagonal and Edge Length Relationship ✅ Face Diagonal and Edge Length Relationship ✅ Important Formulas with Proper Diagrams ✅ Conceptual Understanding for University Examinations 📐 *IMPORTANT FORMULAS* For a cubic unit cell of edge length (a): • Body diagonal: (d_b = \sqrt{3}a)  • Face diagonal: (d_f = \sqrt{2}a) These relationships are important for solving numerical problems related to cubic crystal structures. 🎯 *WHO SHOULD WATCH THIS LECTURE?* This lecture is useful for: • B.Sc. Chemistry Semester 2 students • Vinoba Bhave University (VBU), Hazaribagh – affiliated colleges • Session 2025–29 students • Students preparing for CUET-PG, IIT-JAM, CSIR-NET, GATE and TIFR examinations 🎓 *LECTURE DETAILS* 📖 Subject: Solid State Chemistry 📌 Lecture: 5 (Part 1) 🏫 University: Vinoba Bhave University, Hazaribagh 📚 Semester: 2 📅 Session: 2025–29 👨‍🏫 Educator: Gautam Kumar 📺 Channel: Chemistry with Gautam 💡 *LEARN CONCEPTS, NOT JUST FORMULAS!* Understand the geometry of cubic crystals through diagrams and build a strong foundation for your university examinations and competitive entrance tests. 👍 LIKE the video if it helps you understand the concepts. 📲 SHARE it with your classmates. 🔔 SUBSCRIBE to Chemistry with Gautam for more Chemistry lectures and exam-oriented explanations. 💬 *COMMENT BELOW:* Which topic would you like to practise more — Diamond Cubic Crystal, fractional coordinates, or diagonal–edge length relations? Thank you for learning with Chemistry with Gautam! \#SolidStateChemistry #DiamondCubic #BCC #FCC #SimpleCubic #CrystalStructure #VBUHazaribagh #BScChemistry #ChemistryWithGautam #IITJAM #CUETPG #CSIRNET